Substrate selective synthesis of pyrazolo[1,5-a]pyridines through [3 + 2] cycloaddition of N-aminopyridines and β-nitro styrenes†
Abstract
Synthesis of (hetero)aryl pyrazolo[1,5-a]pyridines through [3 + 2] cycloaddition of N-aminopyridine with β-nitrostyrenes followed by in situ denitration and oxidation under metal-free, mild conditions are described.