4-Amino (or hydrazino)-2-(pyridinyl)pyrimidines

Abstract

Compounds useful as anti-allergic agents are 2-Q-4-[XZC═C(R)NH]-5-R 1 -6-R 2 -pyrimidines (I), where Q is 4- or 3- or 2-pyridinyl or 4- or 3- or 2-pyridinyl having one or two lower-alkyl substituents or N-oxide thereof, R is hydrogen or lower-alkyl, R 1 is hydrogen, lower-alkyl or cyano, R 2 is hydrogen, lower-alkyl, hydroxy or halo, X and Z are the same or different and are each selected from lower-carbalkoxy, lower-alkanoyl, carbamyl and cyano, or ##STR1## is ##STR2## where R 3 and R 4 are each lower-alkyl, or X is hydrogen, are prepared by reacting 4-amino-2-Q-5-R 1 -6-R 2 -pyrimidine (II where Q' is amino) with R'O--C(R)═CXZ (III). Preparation of II are given. Also shown as intermediates and/or anti-allergic agents are 4-(AcNH)-2-Q-5-R 1 -6-R 2 -pyrimidines (IV) and 4-(R 5 R 6 N)-2-Q-5-R 1 -6-R 2 -pyrimidines (V) where Ac is lower-alkanoyl or lower-carbalkoxy, R 5 is hydrogen, lower-alkyl or lower-hydroxyalkyl, and R 6 is lower-alkyl or lower-hydroxyalkyl.

We claim: 
     
       1. A compound of the formula ##STR12## where Q is 4- or 3- or 2-pyridinyl or 4- or 3- or 2-pyridinyl having one or two lower-alkyl substituents or N-oxide thereof, Q' is .[.hydroxy, halo,.]. hydrazino or amino, R 1  is hydrogen, lower-alkyl or cyano, and R 2  is hydrogen, lower-alkyl, hydroxy or halo. 
     
     
       2. A compound according to claim 1 where R 2  is methyl and R 1  is hydrogen. 
     
     
       3. A compound according to claim 2 where Q is 4-pyridinyl or 3-pyridinyl and Q' is amino. .[.4. A compound according to claim 2 where Q' is 
     
     
        halo..]. .[.5. A compound according to claim 2 where Q' is hydroxy..]. 6. A compound according to claim 1 where R 2  and R 1  are each 
     
     
        hydrogen. 7. A compound according to claim 6 where Q is 4-pyridinyl or 
     
     
        3-pyridinyl and Q' is amino. 8. 4-Amino-6-methyl-2-(4-pyridinyl)pyrimidine 
     
     
        according to claim 3. 9. 4-Amino-2-(3-pyridinyl)pyrimidine according to 
     
     
        claim 7. 10. 4-Amino-2-(4-pyridinyl)pyrimidine according to claim 7.