Electrophilicity of α-oxo gold carbene intermediates: halogen abstractions from halogenated solvents leading to the formation of chloro/bromomethyl ketones
作者:Weimin He、Longyong Xie、Yingying Xu、Jiannan Xiang、Liming Zhang
DOI:10.1039/c2ob25235j
日期:——
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.
通过端炔的分子间氧化生成的α-氧代金卡宾被证明具有高度的亲电性,并能有效地从卤化溶剂如1,2-二氯乙烷或1,2-二溴乙烷中提取卤素。使用Ph3PAuNTf2作为催化剂和8-甲基喹啉N-氧化物作为氧化剂,一步法中度效率地合成了氯/溴甲基酮。