Studies on the Synthesis and Cyclization Reactions of2-(5-Amino-3-arylpyrazol-1-yl)-3-methylquinoxalines

Abstract

A series of2-(5-amino-3-arylpyrazol-1-yl)-3-methylquinoxalines (2a–d)has been synthesized by the condensation of2-hydrazino-3-methylquinoxaline (1) with substitutedbenzoylacetonitriles and converted into the corresponding3,4-diaryl-1-(3-methylquinoxalin-2-yl)-4,8-dihydro-1H -pyrazolo[3,4-e ][1,4]thiazepin-7(6H )-ones(7a–d) and2-(3-aryl-4,5,6,7-tetrahydro-5-alkyl/aryl-1H -pyrazolo[3,4-d ]pyrimidin-1-yl)-3-methylquinoxalines(8a–e).