One-pot enol silane formation-Mukaiyama aldol reactions: Crossed aldehyde-aldehyde coupling, thioester substrates, and reactions in ester solvents
作者:C. Wade Downey、Grant J. Dixon、Jared A. Ingersoll、Claire N. Fuller、Kenneth W. MacCormac、Anna Takashima、Rohina Sediqui
DOI:10.1016/j.tetlet.2019.151192
日期:2019.10
Trimethylsilyl trifluoromethanesulfonate (TMSOTf) and a trialkylamine base promote both in situ enol silane/silyl ketene acetal formation and Mukaiyama aldol addition reactions between a variety of reaction partners in a single reaction flask. Isolation of the required enol silane or silyl ketene acetal is not necessary. For example, crossed aldol reactions between α-disubstituted aldehydes and non-enolizable
三甲基甲硅烷基三氟甲磺酸盐(TMSOTf)和三烷基胺碱可在单个反应瓶中促进原位烯醇硅烷/甲硅烷基烯酮缩醛的形成和Mukaiyama aldol加成反应。不需要分离所需的烯醇硅烷或甲硅烷基烯酮缩醛。例如,α-二取代的醛与不可烯化的醛之间的交叉醇醛缩合反应以良好的产率产生β-羟基醛。在相关的反应中,普通的实验室溶剂乙酸乙酯既充当烯醇化物前体又充当绿色反应溶剂。当使用硫酯作为烯醇化物前体时,常规观察到高产率地加成到不可烯化的醛中。