Gold-Catalyzed Hydrohydrazidation of Terminal Alkynes
摘要:
Facile gold-catalyzed hydrohydrazidation of alkynes with various hydrazides (RCONHNH2)-C-2 (R = Alk or Ar; including those with an additional nudeophilic moiety) in the presence of Ph3PAuNTf2 (6 mol %) leading to a wide range of substituted keto-N-acylhydrazones (18 examples) in excellent to good yields (99-66%) is reported. This novel metal-catalyzed coupling proceeds under mild conditions (chlorobenzene, 60 degrees C), exhibits high functional group tolerance, and is insensitive to the electronic and steric effects of the substituents in the reactants.
Recyclable gold(I)-catalyzed hydrohydrazidation of terminal alkynes towards keto-N-acylhydrazones
作者:Siqi Liu、Jianying Li、Wenli Hu、Bin Huang、Mingzhong Cai
DOI:10.1016/j.jorganchem.2022.122411
日期:2022.9
heterogeneous gold(I)-catalyzed hydrohydrazidation of terminal alkynes with diverse hydrazides has been developed in chlorobenzene at 60 °C by using an MCM-41-immobilized diphenylphosphine gold(I) complex [Ph2P-MCM-41-AuNTf2] as the catalyst, providing a novel and practical method for the synthesis of a wide variety of substituted keto-N-acylhydrazones in good to excellent yields. This heterogenizedgold(I) catalyst