Synthesis of Aromatic (<i>E</i>)- or (<i>Z</i>)-α,β-Unsaturated Amides with Total or Very High Selectivity from α,β-Epoxyamides and Samarium Diiodide
作者:José M. Concellón、Eva Bardales
DOI:10.1021/jo0349577
日期:2003.11.1
stereoselective synthesis of aromatic alpha,beta-unsaturated amides was achieved by treatment of aromatic alpha,beta-epoxyamides with samarium diiodide. The starting compounds 1 and 3 are easily prepared by the reaction of enolates derived from alpha-chloroamides with carbonyl compounds at -78 degrees C. A mechanism to explain this transformation is proposed.
通过用二碘化treatment处理芳香族α,β-环氧酰胺,可以高度立体选择性地合成芳香族α,β-不饱和酰胺。起始化合物1和3易于通过衍生自α-氯酰胺的烯醇化物与羰基化合物在-78℃下反应来制备。提出了解释这种转化的机理。