Gold‐Catalyzed Synthesis of Pyrazolo[1,5‐a]pyridines Regioselectively via 6‐endo‐dig Cyclization.

An efficient gold‐catalyzed synthesis of pyrazolo[1,5‐a]pyridines have been developed from pyrazolo substituted propargyl alcohols via 6‐endo‐dig cyclization. In this intramolecular cyclization reaction a new C−N bond was formed regioselectively and good to excellent yields of pyrazolo[1,5‐a]pyridines were obtained in one‐pot. [ABSTRACT FROM AUTHOR]