Electrophilicity of α-oxo gold carbene intermediates: halogen abstractions from halogenated solvents leading to the formation of chloro/bromomethyl ketones
α-Oxo gold carbenes generated via intermolecular oxidation of terminal alkynes are shown to be highly electrophilic and can effectively abstract halogen from halogenated solvents such as 1,2-dichloroethane or 1,2-dibromoethane. Chloro/bromomethyl ketones are prepared in moderate efficiencies in one step using Ph3PAuNTf2 as the catalyst and 8-methylquinoline N-oxide as the oxidant.
Straightforward and Highly Efficient Synthesis of α-Acetoxy Ketones through Gold-Catalyzed Intermolecular Oxidation of Terminal Alkynes
作者:Weimin He、Jiannan Xiang、Chao Wu、Zhiwu Liang、Dong Yan
DOI:10.1055/s-0033-1338513
日期:——
corresponding α-acetoxy ketones throughgold-catalyzedintermolecular oxidation in the presence of 8-methylquinoline 1-oxide as the oxidant. The reaction probably proceeds through an α-oxo gold carbene intermolecular O–H insertion. A variety of terminal alkynes were efficiently converted into the corresponding α-acetoxy ketones throughgold-catalyzedintermolecular oxidation in the presence of 8-methylquinoline
One-Step Synthesis of Methanesulfonyloxymethyl Ketones<i>via</i>Gold-Catalyzed Oxidation of Terminal Alkynes: A Combination of Ligand and Counter Anion Enables High Efficiency and a One-Pot Synthesis of 2,4-Disubstituted Thiazoles
Mor‐DalPhos as the P,N‐bidentate ligand and mesylate as the counter ion, the resulting gold(I) complex catalyzes efficient oxidative transformations of various terminalalkynes into synthetically versatile methanesulfonyloxymethyl ketones. The mild reaction conditions and highefficiency permit the one‐pot synthesis of a range of valuable 2,4‐disubstituted thiazoles by subjecting the resulting reaction