US2007299073A1PendingUtilityA1

Imidazolyl derivatives

Individually held — no corporate assignee on recordPriority: Jun 12, 1998Filed: May 22, 2007Published: Dec 27, 2007
Est. expiryJun 12, 2018(expired)· nominal 20-yr term from priority
A61P 5/06A61P 5/48A61P 9/10A61P 37/06A61P 5/02A61P 9/02A61P 7/04A61P 5/18A61P 3/10A61P 3/06A61P 43/00A61P 9/00A61P 25/00A61P 25/22A61P 29/00A61P 35/00A61P 3/00A61P 27/02A61P 31/04A61P 1/18C07D 487/04A61P 17/00C07D 471/04A61P 1/00A61P 15/00A61P 13/12C07D 233/64C07D 491/14A61P 1/06C07D 401/14C07D 403/06C07D 409/14C07D 471/10C07D 405/14C07D 403/14A61P 1/12A61P 1/04
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Claims

Abstract

The present invention is directed to imidazolyl derivatives of formula (I) where the substituents are defined in the specification, which are useful as agonist or antagonists of somatostatin receptors.

Claims

exact text as granted — not AI-modified
1 . A compound of the formula (I),  
       
         
           
           
               
               
           
         
       
       the racemic-diastereomeric mixtures and optical isomers of said compound of formula (I) and pharmaceutically-acceptable salts thereof,  
       wherein 
    represents an optional bond;  
 R 1  is H, —(CH 2 ) m —C(O)—(CH 2 ) m -Z 1 , —(CH 2 ) m -Z 1 , —(CH 2 ) m —O-Z 1  or —[(C 1 -C 6 )alkyl] p -C(O)—NH—(CH 2 ) m -Z 3 ; 
 Z 1  is an optionally substituted moiety selected from the group consisting of (C 1 -C 12 )alkyl, benzo[b]thiophene, phenyl, naphthyl, benzo[b]furanyl, thiophene, isoxazolyl, indolyl,  
                     
 
 R 2  is H or (C 1 -C 6 )alkyl;  
 or R 1  and R 2  are taken together with the nitrogen atoms to which they are attached to form a compound of formula (Ia), (Ib) or (Ic),  
                     
 R 3  is —(CH 2 ) m -E-(CH 2 ) m -Z 2 ; 
 E is O, S, —C(O)—, —C(O)—O—, —NH—C(O)—O— or a bond;  
 Z 2  is H, (C 1 -C 12 )alkyl, amino, (C 1 -C 12 )alkylamino, N,N-di-(C 1 -C 12 )alkylamino, (C 1 -C 12 )alkylguanidino, or an optionally substituted moiety selected from the group consisting of phenyl, indolyl, imidazolyl, thiophene, benzothiophene, pyridinyl and naphthyl;  
 
 R 4  is H or —(CH 2 ) m -A 1 ; 
 A 1  is —C(═Y)—N(X 1 X 2 ), —C(═Y)—X 2 , —C(═NH)—X 2  or X 2 ; 
 Y is O or S;  
 X 1  is H, (C 1 -C 12 )alkyl, —(CH 2 ) m —NH—(C 1 -C 6 )alkyl, —(CH 2 ) m —N-di-(C 1 -C 6 )alkyl or —(CH 2 ) m -aryl;  
 X 2  is —(CH 2 ) m —Y 1 —X 3  or optionally substituted (C 1 -C 12 )alkyl; 
 Y 1  is O, S, NH, C═O, (C 2 -C 12 )alkenyl having one or more double bonds, —NH—CO—, —CO—NH—, —NH—CO—O—(CH 2 ) m —, —C≡C—, SO 2  or a bond;  
 X 3  is H, an optionally substituted moiety selected from the group consisting of (C 1 -C 12 )alkyl, (C 3 -C 8 )cycloalkyl, (C 1 -C 12 )alkoxy, aryloxy, (C 1 -C 12 )alkylamino, N,N-di-(C 1 -C 12 )alkylamino, —CH-di-(C 1 -C 12 )alkoxy, pyrrolidinyl, pyridinyl, thiophene, imidazolyl, piperidinyl, piperazinyl, benzothiazolyl, furanyl, indolyl, morpholino, benzo[b]furanyl, quinolinyl, isoquinolinyl, —(CH 2 ) m -phenyl, naphthyl, fluorenyl, phthalamidyl, pyrimidinyl,  
                     
 
 or X 1  and X 2  are taken together with the nitrogen to which they are attached to form an optionally substituted moiety selected from the group consisting of thiazolyl  
                     Y 2  is CH—X 4 , N—X 4 , —C(X 4 X 4 ), O or S;    X 4  for each occurrence is independently —(CH 2 ) m —Y 3 —X 5 ;     Y 3  is —C(O)—, —C(O)O— or a bond;     X 5  is hydroxy, (C 1 -C 12 )alkyl, amino, (C 1 -C 12 )alkylamino, N,N-di-(C 1 -C 12 )alkylamino, or an optionally substituted moiety selected from the group consisting of aryl, aryl(C 1 -C 4 )alkyl, furanyl, pyridinyl, indolyl, —CH(phenyl) 2 ,                          
 
 
 R 5  is (C 1 -C 12 )alkyl, [(C 1 -C 6 )alkyl] m -C(O)—O-Z 5 , [(C 1 -C 6 )alkyl] p -C(O)—NH—(CH 2 ) p -Z 3  or optionally substituted aryl; 
 Z 3  for each occurrence is independently amino, (C 1 -C 12 )alkylamino, N,N-di-(C 1 -C 12 )alkylamino, —NH—C(O)—O—(CH 2 ) m -phenyl —NH—C(O)—O—(CH 2 ) m —(C 1 -C 6 )alkyl or an optionally substituted moiety selected from the group consisting of imidazolyl, pyridinyl, morpholino, piperidinyl, piperazinyl, pyrazolidinyl, furanyl and thiophene;  
 
 R 6  is H or (C 1 -C 6 )alkyl;  
 R 7  is (C 1 -C 12 )alkyl or —(CH 2 ) m -Z 4 ; 
 Z 4  is an optionally substituted moiety selected from the group consisting of phenyl, naphthyl, indolyl, thiophene, benzo[b]furan, benzo[b]thiophene, isoxazolyl,  
                     
 Z 5  is H, (C 1 -C 12 )alkyl, (CH 2 ) m -aryl;  
 
 wherein an optionally substituted moiety is optionally substituted by one or more substituents, each independently selected from the group consisting of Cl, F, Br, I, CF 3 , CN, N 3 , NO 2 , OH, SO 2 NH 2 , —OCF 3 , (C 1 -C 12 )alkoxy, —(CH 2 ) m -phenyl-(X 6 ) n , —S-phenyl-(X 6 ) n , —S—(C 1 -C 12 )alkyl, —O—(CH 2 ) m -phenyl-(X 6 ) n , —(CH 2 ) m —C(O)—O—(C 1 -C 6 )alkyl, —(CH 2 ) m —C(O)—(C 1 -C 6 )alkyl, —O—(CH 2 ) m —NH 2 , —O—(CH 2 ) m —NH—(C 1 -C 6 )alkyl, —O—(CH 2 ) m —N-di-((C 1 -C 6 )alkyl) and —[(C 1 -C 12 )alkyl] p -(X 6 ) n ; 
 X 6  for each occurrence is independently selected from the group consisting of hydrogen, Cl, F, Br, I, NO 2 , N 3 , CN, OH, —CF 3 , —OCF 3 , (C 1 -C 12 )alkyl, (C 1 -C 12 )alkoxy,  
 —(CH 2 ) m —NH 2 , —(CH 2 ) m —NH—(C 1 -C 6 )alkyl, —(CH 2 ) m —N-di-((C 1 -C 6 )alkyl) and —(CH 2 ) m -phenyl;  
 
 m for each occurrence is independently 0 or an integer from 1 to 6;  
 n for each occurrence is independently an integer from 1 to 5; and  
 p for each occurrence is independently 0 or 1;  
 provided that:  
 (a) when R 5  is (C 1 -C 12 )alkyl, or —C(O)—O-Z 5  and Z 5  is (C 1 -C 12 )alkyl or optionally substituted aryl; R 6  is H or (C 1 -C 6 )alkyl; R 7  is (C 1 -C 12 )alkyl or Z 4  and Z 4  is thiophene or optionally substituted phenyl, then R 3  is not —C(O)—O—(CH 2 ) m -Z where m is 0 and Z is H or (C 1 -C 12 )alkyl or where m is 1 to 6 and Z is H;  
 (b) when R 5  is (C 1 -C 12 )alkyl or optionally substituted phenyl; R 6  is H or (C 1 -C 6 )alkyl; R 7  is (C 1 -C 12 )alkyl and R 3  is —O—(CH 2 )-Z 2 , then Z 2  is not an optionally substituted moiety selected from the group consisting of phenyl, indolyl, imidazolyl, thiophene, benzothiophene, pyridinyl, and naphthyl;  
 (c) when R 5  is H or (C 1 -C 12 )alkyl; R 6  is (C 1 -C 6 )alkyl; R 7  is (C 1 -C 12 )alkyl; and R 3  is —O-Z 2  or —S-Z 2 , then Z 2  is not an optionally substituted moiety selected from the group consisting of phenyl, naphthyl, thiophene, benzothienyl and indolyl; and  
 (d) at least one m in the definition of R 3  must be an integer from 1 to 6.  
 
     
     
         2 . A compound according to  claim 1  wherein R 1  is H; R 2  is H; R 3  is —CH 2 -phenyl; R 4  is —(CH 2 ) m -A 1  where m in the definition of R 4  is 0; R 5  is phenyl; R 6  is H; 
 where A 1  is —C(═Y)—N(X 1 X 2 ); 
 Y is O; X 1  is H or methyl; 
 X 2  is —(CH 2 ) m —Y 1 —X 3 ; 
 m in the definition of X 2  is 0, 1, 2 or 3; Y 1  is a bond or O; and X 3  is N-methylpyrrolidin-2-yl, diethylamino, pyridinyl, thiophene, imidazolyl, diethoxymethyl, 1-benzyl-piperidin-4-yl, optionally substituted phenyl or  
                     
 
 
   
     
     
         3 . A compound according to  claim 1  wherein R 1  is H; R 2  is H; R 3  is —CH 2 -phenyl; R 4  is —(CH 2 ) m -A 1  where m in the definition of R 4  is 0; R 5  is phenyl; R 6  is H; 
 where A 1  is —C(═Y)—N(X 1 X 2 ); 
 Y is O;  
 X 1  is benzyl and X 2  is 2-hydroxyethyl;  
 or X 1  and X 2  are taken together with the nitrogen atom to which they are attached to form  
                     where Y 2  is C—X 4  or N—X 4 ;    X 4  is —(CH 2 ) m —Y 3 —X 5  where m in the definition of X 4  is 0 or 1; and 
 X 5  is selected from the group consisting of furanyl, benzyl, phenyl, amino,  
                     
   
   
     
     
         4 . A compound according to  claim 1  wherein R 1  is H; R 2  is H; R 3  is —CH 2 -phenyl; R 4  is —(CH 2 ) m -A 1  where m in the definition of R 4  is 0; R 5  is phenyl; R 6  is H; 
 where A 1  is —C(═Y)—X 2 ; 
 Y is O; X 2  is —(CH 2 ) m —Y 1 —X 3 ; 
 where m in the definition of X 2  is 0, 1 or 2;  
 Y 1  is O, —NH—CO—, —CO—NH—, —NH—CO—O—CH 2 —, SO 2  or a bond; and  
 X 3  is methyl, furanyl, pentyl, phenyl, indolyl, p-NO 2 -phenyl, naphthyl, fluorenyl, —CH(phenyl) 2 , benzothiazolyl, phthalamidyl, N,N-dimethylamino,  
                     
 
   
     
     
         5 . A compound according to  claim 1  wherein R 1  is H; R 2  is H; R 3  is —CH 2 -indol-3-yl; R 4  is —(CH 2 ) m -A 1  where m in the definition of R 4  is 0; R 5  is phenyl or t-Bu; R 6  is H; 
 A 1  is —C(═Y)—N(X 1 X 2 ); 
 Y is O or S; X 1  is H; X 2  is —(CH 2 ) m —Y 1 —X 3 ; 
 m in the definition of X 2  is 0, 1 or 2;  
 Y 1  is a bond; and X 3  is phenyl, o-Cl-phenyl, m-Cl-phenyl, p-phenyloxy-phenyl, 2,6-di-isopropylphenyl, m-CF 3 -phenyl, p-ethoxycarbonyl-phenyl, 2,4-difluorophenyl, m-NO 2 -phenyl, p-benzyloxyphenyl, o-isopropylphenyl, n-hexyl, 4-morpholino, naphthyl or  
                     
 
   
     
     
         6 . A compound according to  claim 1  wherein R 1  is H; R 2  is H; R 3  is —CH 2 -indol-3-yl; R 4  is —(CH 2 ) m -A 1  where m in the definition of R 4  is 0; R 5  is phenyl or t-Bu; R 6  is H; 
 where A 1  is —C(═Y)—X 2 ; 
 Y is O; X 2  is —(CH 2 ) m —Y 1 —X 3 ; 
 where m in the definition of X 2  is 0, 1 or 2;  
 Y 1  is O, —CO—NH—, —NH—CO—O—CH 2 -or a bond; and X 3  is methyl, 3-pentyl, phenyl, p-NO 2 -phenyl, phthalamidyl, N,N-dimethylamino, p-aminophenyl, fluorenyl or  
                     
 
   
     
     
         7 . A compound according to  claim 1  wherein R 1  is H; R 2  is H; R 3  is —CH 2 -indol-3-yl; R 4  is —(CH 2 ) m -A 1  where m in the definition of R 4  is 0; R 5  is phenyl or t-Bu; R 6  is H; 
 where A 1  is —C(═Y)—N(X 1 X 2 ); 
 Y is O; X 1  is hydrogen; X 2  is —(CH 2 ) m —Y 1 —X 3 ; 
 where m in the definition of X 2  is 0, 1, 2 or 3;  
 Y 1  is O, or a bond; and X 3  is cyclopentyl, 4-OH-butyl, N,N-diethylamino, N-methyl-pyrrolidin-3-yl, —CH(ethoxy) 2 , phenyl, p-SO 2 NH 2 -phenyl p-OH-phenyl, o-CF 3 -phenyl, p-Cl-phenyl, —CH(phenyl) 2 ,  
                     
 
   
     
     
         8 . A compound according to  claim 1  wherein R 1  is H; R 2  is H; R 3  is —CH 2 -indol-3-yl; R 4  is —(CH 2 ) m -A 1  where m in the definition of R 4  is 0; R 5  is phenyl or t-Bu; R 6  is H; 
 where A 1  is —C(═Y)—X 2 ; 
 Y is O; X 2  is —(CH 2 ) m —Y 1 —X 3 ; 
 where m in the definition of X 2  is 0, 1, 2 or 3;  
 Y 1  is —NH—CO, —C═C—, —C≡C— or a bond; and X 3  is t-butyl, 1-methylcarbonyl-piperidin-4-yl, phenyl, p-Cl-phenyl, m-CF 3 -phenyl, 4-nitro-naphthyl, p-methoxy-phenyl, m-(phenylethyl)-phenyl, indol-3-yl or p-aminophenyl.  
 
   
     
     
         9 . (canceled)  
     
     
         10 . A compound according to  claim 1  wherein R 1  is H; R 2  is H; R 3  is —CH 2 -indol-3-yl, —(CH 2 ) 4 —NH—CO—O-t-Bu or —(CH 2 ) 4 —NH 2 ; R 4  is —(CH 2 ) m -A 1  where m in the definition of R 4  is 0; R 5  is phenyl, o-methoxyphenyl, p-methoxyphenyl, p-Br-phenyl, p-nitro-phenyl or p-N,N-diethylamino-phenyl; R 6  is H; 
 where A 1  is —C(═Y)—X 2 ; 
 Y is O; X 2  is —(CH 2 ) m —Y 1 X 3 ; 
 where m in the definition of X 2  is 1;  
 Y 1  is a bond; and X 3  is phenyl, o-Br-phenyl, m-Br-phenyl, p-Br-phenyl, o-Cl-phenyl, m-Cl-phenyl, p-Cl-phenyl, o-nitro-phenyl, m-nitro-phenyl, p-nitro-phenyl, o-CF 3 -phenyl, m-CF 3 -phenyl, p-CF 3 -phenyl, o-F-phenyl, m-F-phenyl, p-F-phenyl, N,N-di-methylamino-phenyl, o-OMe-phenyl, m-OMe-phenyl, p-OMe-phenyl, 3,4-di-Cl-phenyl, 3,4,5-tri-OMe-phenyl, p-Me-phenyl, p-OH-phenyl or 2,4-di-F-phenyl.  
 
   
     
     
         11 . (canceled)  
     
     
         12 . A compound according to  claim 10  wherein R 5  is phenyl and R 3  is —(CH 2 )-indol-3-yl and the stereochemistry at the carbon to which R 3  is attached is the R-configuration.  
     
     
         13 . A compound according to  claim 10  wherein R 5  is o-OMe-phenyl and R 3  is —(CH 2 )-indol-3-yl and the stereochemistry at the carbon to which R 3  is attached is the R-configuration.  
     
     
         14 . A compound according to  claim 10  wherein R 5  is o-OMe-phenyl and R 3  is —(CH 2 )-indol-3-yl and the stereochemistry at the carbon to which R 3  is attached is the S-configuration.  
     
     
         15 . A compound according to  claim 1  wherein R 1  is H; R 2  is H; R 3  is —(CH 2 ) 4 —NH—CO—O-t-Bu or —(CH 2 ) 4 —NH 2 ; R 4  is —(CH 2 ) m -A 1  where m in the definition of R 4  is 0; R 5  is phenyl; R 6  is H; 
 where A 1  is —C(═Y)—X 2 ; 
 Y is O; X 2  is —(CH 2 ) m —Y 1 —X 3 ; 
 where m in the definition of X 2  is 0,1 or 2;  
 Y 1  is S, SO 2  or a bond; and X 3  is phenyl, 3,4-di-Cl-phenyl, 3,4,5-tri-OMe-phenyl, p-Me-phenyl, p-OH-phenyl, 2,4-di-F-phenyl, 2-furanyl, 2-pyridinyl, 3-pyridinyl, naphthyl, 2-quinolinyl, 3-quinolinyl, 4-quinolinyl, 8-quinolinyl, 1-isoquinolinyl, 2-thiophene or 2-pyrimidinyl.  
 
   
     
     
         16 . A compound according to  claim 1  wherein R 1  is H; R 2  is H; R 3  is —(CH 2 ) 4 —NH—CO—O-t-Bu or —(CH 2 ) 4 —NH 2 ; R 4  is —(CH 2 ) m -A 1  where m in the definition of R 4  is 0; R 5  is phenyl; R 6  is H; 
 where A 1  is —C(═Y)—X 2 ; 
 Y is O; X 2  is —(CH 2 ) m —Y 1 —X 3 ; 
 where m in the definition of X 2  is 0, 1, 2 or 3;  
 Y 1  is a bond; and X 3  is 5-indolyl, 3-indolyl, 4-indolyl, 2-indolyl, 5-OMe-indol-3-yl, 5-OMe-indol-2-yl, 5-OH-indol-2-yl, 5-OH-indol-3-yl, 5-Br-indol-3-yl, 2-Me-indol-3-yl, 2-benzothiophene, 3-benzothiophene or 2-benzofuran.  
 
   
     
     
         17 . A compound according to  claim 1  wherein R 1  is H; R 2  is H; R 3  is —(CH 2 ) m -indol-3-yl, —(CH 2 ) 4 —NH—CO—O-t-Bu or —(CH 2 ) 4 —NH 2 ; R 4  is —(CH 2 ) m -A 1  where m in the definition of R 4  is 0; R 5  is phenyl, o-OMe-phenyl or p-OMe-phenyl; R 6  is H; 
 where A 1  is X 2 ; 
 X 2  is —(CH 2 ) m —Y 1 —X 3 ; 
 where m in the definition of X 2  is 1, 2 or 3;  
 Y 1  is S, O or a bond; and X 3  is phenyl, o-OH-phenyl, p-OH-phenyl, o-F-phenyl, m-F-phenyl, p-F-phenyl, o-CF 3 -phenyl, o-OMe-phenyl, m-OMe-phenyl, o-nitro-phenyl, p-nitro-phenyl, 3,4-di-Cl-phenyl, 2-nitro-3-OMe-phenyl, o-Br-phenyl, m-Br-phenyl, p-Br-phenyl, 2-thiophene, 3,4,5-tri-OMe-phenyl, p-N,N-dimethylamino-phenyl, p-OCF 3 -phenyl, p-(3-(N,N-dimethylamino)propoxy)phenyl, 3-F-4-OMe-phenyl, 2-pyridinyl, 3-pyridinyl, 4-pyridinyl, 2-Cl-quinolin-3-yl, 2-quinolinly, methyl, n-butyl, n-pentyl, n-hexyl, 3,3-dimethyl-butyl, benzyl, cyclohexyl or p-t-Bu-phenyl.  
 
   
     
     
         18 . A compound according to  claim 1  wherein R 1  is H; R 2  is H; R 3  is —(CH 2 ) 4 —NH—CO—O-t-Bu or —(CH 2 ) 4 —NH 2 ; R 4  is —(CH 2 ) m -A 1  where m in the definition of R 4  is 0; R 5  is phenyl; R 6  is H; 
 where A 1  is X 2 ; 
 X 2  is —(CH 2 ) m —Y 1 —X 3 ; 
 where m in the definition of X 2  is 1, 2 or 3;  
 Y 1  is O or a bond; and X 3  is phenyl, o-OH-phenyl, p-OH-phenyl, o-F-phenyl, m-F-phenyl, p-F-phenyl, o-CF 3 -phenyl, o-OMe-phenyl, m-OMe-phenyl, p-OMe-phenyl, o-nitro-phenyl, p-nitro-phenyl, 3,4-di-Cl-phenyl, 2-nitro-3-OMe-phenyl, o-Br-phenyl, m-Br-phenyl, p-Br-phenyl, p-phenyl-phenyl, 2-thiophene, 3,4,5-tri-OMe-phenyl, p-N,N-dimethylamino-phenyl, p-benzyloxy-phenyl, p-OCF 3 -phenyl, p-(3-(N,N-dimethylamino)propoxy)phenyl, 3-F-4-OMe-phenyl, 2-pyridinyl, 3-pyridinyl, 4-pyridinyl, 2-Cl-quinolin-3-yl, 2-quinolinly, 3-indolyl, 6-methoxycarbonyl-indol-3-yl, 1-methyl-indol-3-yl, 2-methyl-indol-3-yl, methyl, n-butyl, n-pentyl, n-hexyl, 3,3-dimethyl-butyl, benzyl, cyclohexyl or p-t-Bu-phenyl.  
 
   
     
     
         19 . A compound according to  claim 1  wherein R 1  is —(CH 2 )—CO-Z 1 ; R 2  is H; R 3  is —(CH 2 ) 4 —NH—CO—O-t-Bu, —(CH 2 ) 4 —NH—CO—O-benzyl, —(CH 2 )-phenyl or —(CH 2 )-indol-3-yl; R 4  is —(CH 2 ) m -A 1  where m in the definition of R 4  is 0; R 5  is phenyl; R 6  is H; 
 where Z 1  is ethyl, phenyl, p-OMe-phenyl, p-phenyl-phenyl, p-Cl-phenyl, p-Br-phenyl, p-N 3 -phenyl, p-F-phenyl, m-nitro-phenyl, p-nitro-phenyl, p-CN-phenyl, 2,5-di-OMe-phenyl, 3,4-di-Cl-phenyl, N,N-dimethylamino-phenyl, 3-methyl-4-Cl-phenyl or naphthyl;    A 1  is —C(═Y)—X 2 ; 
 Y is O; X 2  is —(CH 2 ) m —Y 1 —X 3 ; 
 where m in the definition of X 2  is 0;  
 Y 1  is O; and X 3  is t-Bu.  
 
   
     
     
         20 . A compound according to  claim 1  wherein R 1  is —(CH 2 )—CO—(CH 2 ) m -Z 1  where m in the definition of R 1  is 0, 1 or 2; R 2  is H; R 3  is —(CH 2 )-indol-3-yl or —(CH 2 ) 4 —NH—CO—O-t-Bu; R 4  is H or —(CH 2 ) m -A 1  where m in the definition of R 4  is 0; R 5  is phenyl, o-OMe-phenyl, p-nitro-phenyl, p-Br-phenyl, t-Bu, —CH(CH 3 ) 2 —CO—NH—(CH 2 ) 2 —CO—O-t-Bu, —CH(CH 3 ) 2 —CO—NH—(CH 2 ) 3 -imidazol-1-yl, —CH(CH 3 ) 2 —CO—NH—(CH 2 ) 2 -pyridin-2-yl, —CH(CH 3 ) 2 —CO—NH—(CH 2 ) 3 -4-morpholino, —CH(CH 3 ) 2 -CO—NH—(CH 2 )-pyridin-4-yl or —CH(CH 3 ) 2 —CO—NH—(CH 2 ) 2 —N,N-diethylamino; R 6  is H; 
 where Z 1  is ethyl, propyl, phenyl, p-OMe-phenyl, p-Cl-phenyl, p-Br-phenyl, p-F-phenyl, p-nitro-phenyl, m-nitro-phenyl, p-CN-phenyl, p-N 3 -phenyl, p-phenyl-phenyl, 3-Me-4-Cl-phenyl, p-N,N-diethylamino-phenyl, 2,5-di-OMe-phenyl, 3,4-di-Cl-phenyl, 3,4-di-F-phenyl, p-OCF 3 -phenyl, p-benzyloxy-phenyl, p-pentyl-phenyl, 3,4,5-tri-OMe-phenyl, 3-nitro-4-Cl-phenyl, 3-Cl-4-nitro-phenyl, 3-methyl-5-chloro-benzothiophen-2-yl, 2-benzofuranyl, 3-benzothiophene, 3-phenyl-isoxazol-5-yl, 3-(2,4-di-Cl-phenyl)-isoxazol-5-yl, 3-indolyl, 5-Br-thiophen-2-yl, naphthyl,                          A 1  is —C(═Y)—X 2 ; 
 Y is O; X 2  is —(CH 2 ) m —Y 1 —X 3 ; 
 where m in the definition of X 2  is 0;  
 Y 1  is O; and X 3  is t-Bu.  
 
   
     
     
         21 . A compound according to  claim 1  wherein R 1  and R 2  are taken together to form a compound of formula (Ib) or (Ic); 
 R 3  is —(CH 2 )-indol-3-yl, —(CH 2 )-phenyl, —(CH 2 ) 4 —NH—CO—O-benzyl or —(CH 2 ) 4 —NH 2 ;    R 5  is phenyl, o-OMe-phenyl, p-OMe-phenyl, p-Br-phenyl, p-nitro-phenyl, t-Bu or —CH(CH 3 ) 2 —CO—NH—(CH 2 ) 2 —NH 2 ; R 6  is H; 
 R 7  is ethyl, propyl, phenyl, p-OMe-phenyl, p-Cl-phenyl, p-Br-phenyl, p-F-phenyl, p-nitro-phenyl, m-nitro-phenyl, p-CN-phenyl, p-N 3 -phenyl, p-phenyl-phenyl, 3-Me-4-Cl-phenyl, p-N,N-diethylamino-phenyl, 2,5-di-OMe-phenyl, 3,4-di-Cl-phenyl, 3,4-di-F-phenyl, p-OCF 3 -phenyl, p-benzyloxy-phenyl, p-pentyl-phenyl, 3,4,5-tri-OMe-phenyl, 3-nitro-4-Cl-phenyl, 3-Cl-4-nitro-phenyl, 3-methyl-5-chloro-benzothiophen-2-yl, 2-bezofuranyl, 3-benzothiophene, 3-phenyl-isoxazol-5-yl, 3-(2,4-di-Cl-phenyl)-isoxazol-5-yl, 3-indolyl, 5-Br-thiophen-2-yl, naphthyl,  
                     
   
     
     
         22 . A compound of the formula (II),  
       
         
           
           
               
               
           
         
       
       the racemic-diastereomeric mixtures and optical isomers of said compound of formula (II), the pharmaceutically-acceptable salts or prodrugs thereof or a pharmaceutically acceptable salt of said prodrug,  
       wherein 
    represents an optional bond;  
 R 1  is H, —(CH 2 ) m —C(O)—(CH 2 ) m -Z 1 , —(CH 2 ) m -Z 1 , —(CH 2 ) m —O-Z 1  or —(C 0 -C 6 )alkyl-C(O)—NH—(CH 2 ) m -Z 3 ; 
 Z 1  is an optionally substituted moiety selected from the group consisting of (C 1 -C 12 )alkyl, benzo[b]thiophene, phenyl, naphthyl, benzo[b]furanyl, thiophene, isoxazolyl, indolyl,  
                     
 
 R 2  is H or (C 1 -C 6 )alkyl;  
 or R 1  and R 2  are taken together with the nitrogen atoms to which they are attached to form a compound of formula (IIa), (IIb) or (IIc),  
                     
 R 3  is —(CH 2 ) m -E-(CH 2 ) m -Z 2 ; 
 E is O, S, —C(O)—, —C(O)—O—, —NH—C(O)—O—, —N(C 1 -C 6 )alkyl-C(O)—O— or a bond;  
 Z 2  is H, (C 1 -C 12 )alkyl, amino, (C 1 -C 12 )alkylamino, N,N-di-(C 1 -C 12 )alkylamino, (C 1 -C 12 )alkylguanidino, or an optionally substituted moiety selected from the group consisting of phenyl, indolyl, imidazolyl, thiophene, benzothiophene, pyridinyl and naphthyl;  
 
 R 4  is H or —(CH 2 ) m -A 1 ; 
 A 1  is —C(═Y)—N(X 1 X 2 ), —C(═Y)—X 2 , —C(═NH)—X 2  or X 2 ; 
 Y is O or S;  
 X 1  is H, (C 1 -C 12 )alkyl, —(CH 2 ) m —NH—(C 1 -C 6 )alkyl, —(CH 2 ) m —N-di-(C 1 -C 6 )alkyl or —(CH 2 ) m -aryl;  
 X 2  is —(CH 2 ) m —Y 1 —X 3  or optionally substituted (C 1 -C 12 )alkyl; 
 Y 1  is O, S, NH, C═O, (C 2 -C 12 )alkenyl having one or more double bonds, —NH—CO—, —CO—NH—, —NH—CO—O—(CH 2 ) m —, —C≡C—, SO 2  or a bond;  
 X 3  is H, an optionally substituted moiety selected from the group consisting of (C 1 -C 12 )alkyl, (C 3 -C 8 )cycloalkyl, (C 1 -C 12 )alkoxy, aryloxy, (C 1 -C 12 )alkylamino, N,N-di-(C 1 -C 12 )alkylamino, —CH-di-(C 1 -C 12 )alkoxy, pyrrolidinyl, pyridinyl, thiophene, imidazolyl, piperidinyl, piperazinyl, benzothiazolyl, furanyl, indolyl, morpholino, benzo[b]furanyl, quinolinyl, isoquinolinyl, —(CH 2 ) m -phenyl, naphthyl, fluorenyl, phthalamidyl, pyrimidinyl,  
                     
 
 or X 1  and X 2  are taken together with the nitrogen to which they are attached to form an optionally substituted moiety selected from the group consisting of thiazolyl,  
                     Y 2  is CH—X 4 , N—X 4 , —C(X 4 X 4 ), O or S;    X 4  for each occurrence is independently H or —(CH 2 ) m —Y 3 —X 5 ;     Y 3  is —C(O)—, —C(O)O— or a bond;     X 5  is hydroxy, (C 1 -C 12 )alkyl, amino, (C 1 -C 12 )alkylamino, N,N-di-(C 1 -C 12 )alkylamino, or an optionally substituted moiety selected from the group consisting of aryl, aryl(C 1 -C 4 )alkyl, furanyl, pyridinyl, indolyl, piperidinyl, —CH(phenyl) 2 ,                          
 
 
 R 5  is (C 1 -C 12 )alkyl, (C 0 -C 6 )alkyl-C(O)—O-Z 5 , (C o -C 6 )alkyl-C(O)—NH—(CH 2 ) m -Z 3  or optionally substituted aryl; 
 Z 3  for each occurrence is independently amino, (C 1 -C 12 )alkylamino, amino(C 1 -C 12 )alkyl, (C 5 -C 7 )cycloalkylamino, amino(C 5 -C 7 )cycloalkyl, N-(C 1 -C 12 )alkylamino, N,N-di-(C 1 -C 12 )alkylamino, —NH—C(O)—O—(CH 2 ) m -phenyl, —NH—C(O)—O—(CH 2 ) m -(C 1 -C 6 )alkyl,  
                     
 or an optionally substituted moiety selected from the group consisting of imidazolyl, pyridinyl, morpholino, piperidinyl, piperazinyl, pyrazolidinyl, furanyl, phenyl, indolyl and thiophene, provided that when m is 0 in the formula for R 5  then Z 3  is not —NH—C(O)—O—(CH 2 ) m -phenyl or —NH—C(O)—O—(CH 2 ) m —(C 1 -C 6 )alkyl;  
 
 R 6  is H or (C 1 -C 6 )alkyl;  
 R 7  is (C 1 -C 12 )alkyl or —(CH 2 ) m -Z 4 ; 
 Z 4  is an optionally substituted moiety selected from the group consisting of phenyl, naphthyl, indolyl, thiophene, benzo[b]furan, benzo[b]thiophene, isoxazolyl,  
                     
 Z 5  is H, (C 1 -C 12 )alkyl, or —(CH 2 ) m -aryl;  
 
 wherein an optionally substituted moiety is optionally substituted by one or more substituents, each independently selected from the group consisting of Cl, F, Br, I, CF 3 , CN, N 3 , NO 2 , OH, SO 2 NH 2 , —OCF 3 , (C 1 -C 12 )alkoxy, —(CH 2 ) m -phenyl-(X 6 ) n , —S-phenyl-(X 6 ) n , —S—(C 1 -C 12 )alkyl, —O—(CH 2 ) m -phenyl-(X 6 ) n , —(CH 2 ) m —C(O)—O—(C 1 -C 6 )alkyl, —(CH 2 ) m —C(O)—(C 1 -C 6 )alkyl, —O—(CH 2 ) m —NH 2 , —O—(CH 2 ) m —NH—(C 1 -C 6 )alkyl, —O—(CH 2 ) m —N-di-((C 1 -C 6 )alkyl), —(C 0 -C 12 )alkyl-(X 6 ) n  and —(CH 2 ) m -phenyl-X 7 ; 
 X 6  for each occurrence is independently selected from the group consisting of hydrogen, Cl, F, Br, I, NO 2 , N 3 , CN, OH, —CF 3 , —OCF 3 , (C 1 -C 12 )alkyl, (C 1 -C 12 )alkoxy, —(CH 2 ) m —NH 2 , —(CH 2 ) m —NH—(C 1 -C 6 )alkyl, —(CH 2 ) m —N-di-((C 1 -C 6 )alkyl) and —(CH 2 ) m -phenyl;  
 X 7  is —NH—C(═NH.HI)—X 8 , wherein X 8  is thiophene, (C 1 -C 6 )alkyl or phenyl;  
 
 m for each occurrence is independently 0 or an integer from 1 to 6; and  
 n for each occurrence is independently an integer from 1 to 5;  
 provided that:  
 (a) when R 5  is (C 1 -C 12 )alkyl, or —C(O)—O-Z 5  and Z 5  is (C 1 -C 12 )alkyl or optionally substituted aryl; R 6  is H or (C 1 -C 6 )alkyl; R 7  is (C 1 -C 12 )alkyl or Z 4  and Z 4  is thiophene or optionally substituted phenyl, then R 3  is not —C(O)—O—(CH 2 ) m -Z where m is 0 and Z is H or (C 1 -C 12 )alkyl or where m is 1 to 6 and Z is H;  
 (b) when R 5  is (C 1 -C 12 )alkyl or optionally substituted phenyl; R 6  is H or (C 1 -C 6 )alkyl; R 7  is (C 1 -C 12 )alkyl and R 3  is —O—(CH 2 )-Z 2 , then Z 2  is not an optionally substituted moiety selected from the group consisting of phenyl, indolyl, imidazolyl, thiophene, benzothiophene, pyridinyl, and naphthyl; and  
 (c) when R 5  is H or (C 1 -C 12 )alkyl; R 6  is (C 1 -C 6 )alkyl; R 7  is (C 1 -C 12 )alkyl; and R 3  is —O-Z 2  or —S-Z 2 , then Z 2  is not an optionally substituted moiety selected from the group consisting of phenyl, naphthyl, thiophene, benzothienyl and indolyl.  
 
     
     
         23 . A compound according to  claim 22  of the formula  
       
         
           
           
               
               
           
         
         wherein  
         Z 3  is —CH 2 —NH 2 , —(CH 2 ) 2 —NH 2 , —(CH 2 ) 3 —NH 2  or  
         
           
             
             
                 
                 
             
           
         
         X 1  is —(CH 2 ) 2 —N(CH 3 ) 2  and X 2  is benzyl; or  
         X 1  and X 2  are taken together with the nitrogen atom to which they are attached, to form  
         
           
             
             
                 
                 
             
           
         
       
     
     
         24 . (canceled)  
     
     
         25 . A compound according to  claim 22  of the formula  
       
         
           
           
               
               
           
         
       
       wherein X 2  is p-chloro-phenyl, p-methoxy-phenyl, 2,4-difluoro-phenyl or thienyl.  
     
     
         26 . A compound according to  claim 22  of the formula  
       
         
           
           
               
               
           
         
       
       wherein X 2  is p-chloro-phenyl, p-methoxy-phenyl, phenyl or thienyl.  
     
     
         27 . (canceled)  
     
     
         28 . (canceled)  
     
     
         29 . A compound according to  claim 22  of the formula  
       
         
           
           
               
               
           
         
       
     
     
         30 . A pharmaceutical composition comprising a compound according to  claim 1  or a pharmaceutically acceptable salt thereof and a pharmaceutically acceptable carrier.  
     
     
         31 . A method of eliciting an agonist effect from one or more of a somatostatin subtype receptor in a subject in need thereof, which comprises administering a compound according to  claim 1  or a pharmaceutically acceptable salt thereof to said subject.  
     
     
         32 . A method of eliciting an antagonist effect from one or more of a somatostatin subtype receptor in a subject in need thereof, which comprises administering a compound according to  claim 1  or a pharmaceutically acceptable salt thereof to said subject.  
     
     
         33 . A method of binding one or more of a somatostatin subtype receptor in a subject in need thereof, which comprises administering a compound according to  claim 1  or a pharmaceutically acceptable salt thereof to said subject.  
     
     
         34 . A method of treating acromegaly, restenosis, Crohn's disease, systemic sclerosis, external and internal pancreatic pseudocysts and ascites, VIPoma, nesidoblastosis, hyperinsulinism, gastrinoma, Zollinger-Ellison Syndrome, diarrhea, AIDS related diarrhea, chemotherapy related diarrhea, scleroderma, Irritable Bowel Syndrome, pancreatitis, small bowel obstruction, gastroesophageal reflux, duodenogastric reflux, Cushing's Syndrome, gonadotropinoma, hyperparathyroidism, Graves' Disease, diabetic neuropathy, Paget's disease, polycystic ovary disease, cancer, cancer cachexia, hypotension, postprandial hypotension, panic attacks, GH secreting adenomas or TSH secreting adenomas, in a subject in need thereof, which comprises administering a compound according to  claim 1  or a pharmaceutically acceptable salt thereof to said subject.  
     
     
         35 . A method of treating diabetes mellitus, hyperlipidemia, insulin insensitivity, Syndrome X, angiopathy, proliferative retinopathy, dawn phenomenon, Nephropathy, peptic ulcers, enterocutaneous and pancreaticocutaneous fistula, Dumping syndrome, watery diarrhea syndrome, acute or chronic pancreatitis, gastrointestinal hormone secreting tumors, angiogenesis, inflammatory disorders, chronic allograft rejection, angioplasty, graft vessel bleeding or gastrointestinal bleeding in a subject in need thereof, which comprises administering a compound according to  claim 1  or a pharmaceutically acceptable salt thereof to said subject.  
     
     
         36 . A method of inhibiting the proliferation of helicobacter pylori in a subject in need thereof, which comprises administering a compound according  claim 1  or a pharmaceutically acceptable salt thereof, to said subject.  
     
     
         37 . A pharmaceutical composition comprising a compound according to  claim 22  or a pharmaceutically acceptable salt thereof and a pharmaceutically acceptable carrier.  
     
     
         38 . A method of eliciting an agonist effect from one or more of a somatostatin subtype receptor in a subject in need thereof, which comprises administering a compound according to  claim 22  or a pharmaceutically acceptable salt thereof to said subject.  
     
     
         39 . A method of eliciting an antagonist effect from one or more of a somatostatin subtype receptor in a subject in need thereof, which comprises administering a compound according to  claim 22  or a pharmaceutically acceptable salt thereof to said subject.  
     
     
         40 . A method of binding one or more somatostatin subtype receptor in a subject in need thereof, which comprises administering a compound according to  claim 22  or a pharmaceutically acceptable salt thereof to said subject.  
     
     
         41 . A method of treating acromegaly, restenosis, Crohn's disease, systemic sclerosis, external and internal pancreatic pseudocysts and ascites, VIPoma, nesidoblastosis, hyperinsulinism, gastrinoma, Zollinger-Ellison Syndrome, diarrhea, AIDS related diarrhea, chemotherapy related diarrhea, scleroderma, Irritable Bowel Syndrome, pancreatitis, small bowel obstruction, gastroesophageal reflux, duodenogastric reflux, Cushing's Syndrome, gonadotropinoma, hyperparathyroidism, Graves' Disease, diabetic neuropathy, Paget's disease, polycystic ovary disease, cancer, cancer cachexia, hypotension, postprandial hypotension, panic attacks, GH secreting adenomas or TSH secreting adenomas, in a subject in need thereof, which comprises administering a compound according to  claim 22  or a pharmaceutically acceptable salt thereof to said subject.  
     
     
         42 . A method of treating diabetes mellitus, hyperlipidemia, insulin insensitivity, Syndrome X, angiopathy, proliferative retinopathy, dawn phenomenon, Nephropathy, peptic ulcers, enterocutaneous and pancreaticocutaneous fistula, Dumping syndrome, watery diarrhea syndrome, acute or chronic pancreatitis, gastrointestinal hormone secreting tumors, angiogenesis, inflammatory disorders, chronic allograft rejection, angioplasty, graft vessel bleeding or gastrointestinal bleeding in a subject in need thereof, which comprises administering a compound according to  claim 22  or a pharmaceutically acceptable salt thereof to said subject.  
     
     
         43 . A method of inhibiting the proliferation of helicobacter pylori in a subject in need thereof, which comprises administering a compound according  claim 22  or a pharmaceutically acceptable salt thereof, to said subject.

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