Triazole acetyl gold(III) catalyzed Meyer–Schuster rearrangement of propargyl alcohols
作者:Yongchun Yang、Yanan Shen、Xiaoli Wang、Yao Zhang、Dawei Wang、Xiaodong Shi
DOI:10.1016/j.tetlet.2016.04.043
日期:2016.5
A new type triazole acetyl gold(III) was prepared and found to be an effective catalyst in Meyer–Schusterrearrangement of propargyl alcohols. The reactions proceeded well under much milder conditions to afford enones bearing a wide range of functional groups, thereby opening a new avenue for gold(III) catalysis. In addition, TriaAuCl2 catalyst was also effective on promotion of a-haloenones synthesis
no hydroacylations exist that make use of aldehydes without a chelating group, especially when combined with terminal alkynes. Here we report a synergistic nickel–photocatalytic system that allows for the highly regio- and stereoselective hydroacylation of unactivated aldehydes and alkynes in milder conditions without the use of chelating groups.
Commercially available (aqueous) hypophosphorus acid is an efficient catalyst for the synthesis of α,β-unsaturated carbonyl compounds from their corresponding propargylic alcohols. Reactions were carried out in technical toluene in the presence of air and in several instances the desired products were isolated analytically pure after a simple work-up.