Triazole–Au(I) complex as chemoselective catalyst in promoting propargyl ester rearrangements
作者:Dawei Wang、Yanwei Zhang、Rong Cai、Xiaodong Shi
DOI:10.3762/bjoc.7.115
日期:——
propargyl ester rearrangement. Good chemoselectivity was observed, which allowed the effective activation of the alkyne without affecting the reactivity of the allene ester intermediates. These results led to the investigation of the preparation of allene ester intermediates with TA-Au catalysts underanhydrous conditions. As expected, the desired 3,3-rearrangement products were obtained in excellent yields
Practical Synthesis of Linear α-Iodo/Bromo-α,β-unsaturated Aldehydes/Ketones from Propargylic Alcohols via Au/Mo Bimetallic Catalysis
作者:Longwu Ye、Liming Zhang
DOI:10.1021/ol901346k
日期:2009.8.20
An efficient synthesis of α-iodo/bromo-α,β-unsaturated aldehydes/ketones directly frompropargylicalcohols is described. This reaction is catalyzed collaboratively by two metal complexes, Ph3PAuNTf2 and MoO2(acac)2, and Ph3PO as an additive helps suppress undesired enone/enal formation. Notable features of this method include low catalyst loadings, mild reaction conditions, and mostly good to excellent