New Routes for Novel Pyrazolo[3,4- b ][1,6]-naphthyridine,Pyrazolo[3,4- b ]pyridine and Pyrazolo[3,4:2,3]pyrido[6,1-a]benzimidazole Derivatives

Abstract

Pyrazolo[3,4-b] [1,6] naphthyridine, pyrazolo[3,4-b] pyridine and pyrazolo[3,4:2,3] pyrido [6,1 -a] benzimidazole derivatives are synthesized starting from the isomeric 3-substituted 5-chloro-1-phenylpyrazole-4-carbaldehyde.