Synthesis of Some Novel Fluorinated Pyrazolo[3,4‐b]Pyridines
摘要:
Reaction of 5-amino-3-substituted pyrazoles (1a-c) and 5-amino-1,3-disubstituted pyrazoles (1d-i) with fluorinated-beta-diketones (2) results in the formation of the single isomer of pyrazolo[3,4-b]pyridines (4a-h). A one-pot procedure for the synthesis of title compounds starting from alpha-cyanoacetophenones along with a possible mechanistic pathway for the formation of the title compounds is described.