Simple and green synthesis of 3‐acyl‐pyrazolo[1,5‐a]pyridines: [3+2] through cycloaddition of N‐aminopyridines on enaminones

Abstract

A practicable method is described for the synthesis of 3‐acyl‐pyrazolo[1,5‐a]pyridines from N‐aminopyridines and easily available enaminones via a [3+2] cycloaddition. The reactions proceed well with a broad scope, without using additive (base or oxidant).