Efficient [(NHC)Au(NTf<sub>2</sub>)]-catalyzed hydrohydrazidation of terminal and internal alkynes
作者:Maximillian Heidrich、Herbert Plenio
DOI:10.3762/bjoc.16.175
日期:——
The efficient hydrohydrazidation of terminal (6a–r, 18 examples, 0.1–0.2 mol % [(NHC)Au(NTf2)], T = 60 °C) and internal alkynes (7a–j, 10 examples, 0.2–0.5 mol % [(NHC)Au(NTf2)], T = 60–80 °C) utilizing a complex with a sterically demanding bispentiptycenyl-substituted NHC ligand and the benign reaction solvent anisole, is reported.
An asymmetrichydrogenation of hydrazones with a unique nickel catalyst has been developed for the synthesis of chiral hydrazines with up to 99 % yield and 99.4 : 0.6 er and a broad substrate scope. Deuterium labelling experiments indicated that the hydrazone substrates undergo imine-enamine tautomerization in the mixed solvents.
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