Synthesis, molecular structure and tautomerism of 1(2)H-dihydropyrazolo[3,4-b]pyridin-6-ones

Abstract

Six 1(2)H-3-aryl-4-p-chlorophenyl-dihydropyrazolo[3,4-b]pyridin-6-ones have been prepared from the corresponding arylaminopyrazoles. The NMR study of these compounds reveals that all of them exist as 2H-tautomers in solution (DMSO-d6) as well and in the solid state.