Pd-Catalyzed Oxidative Annulation of Hydrazides with Isocyanides: Synthesis of 2-Amino-1,3,4-oxadiazoles
摘要:
An efficient palladium-catalyzed oxidative annulation reaction was developed through sequential isocyanide insertions into N-H and O-H bonds of hydrazides, which provides an efficient access to valuable 2-amino-1,3,4-oxadiazoles and their derivatives.
A novel sulfur‐promoted cyclization of hydrazides and isonitriles to produce 1,3,4‐oxadiazole has been developed. The method is operationally simple and compatible with a wide scope of substrates and various 2‐amino‐ 1,3,4‐oxadiazoles are efficiently obtained in good yields.