Ynolate Chemistry. Reaction of a Silylynolate with Aziridines Leading to γ-Lactams
作者:Keiji Iwamoto、Miki Kojima、Naoto Chatani、Shinji Murai
DOI:10.1021/jo0012804
日期:2001.1.1
good yields. The key step of this reaction involves the ring-opening ketenylation of aziridines by the silylynolate. The reaction proceeded in a highly stereoselective manner, and ketenylation took place at the less hindered carbon. When treated with aldehydes prior to protonation, the alpha-silylated lactam enolates gave alpha-vinylidene gamma-lactams. These reactions represent a unique path to the generation
使通过甲硅烷基重氮甲烷的羰基化反应生成的甲硅烷基磺酸盐与N-甲苯磺酰基氮丙啶反应生成高收率的各种五元内酰胺。该反应的关键步骤涉及通过甲硅烷基苯磺酸盐使氮丙啶的开环烯酮化。该反应以高度立体选择性的方式进行,并且烯基化发生在受阻较少的碳上。当在质子化之前用醛处理时,α-甲硅烷基化的内酰胺烯醇化物得到α-亚乙烯基γ-内酰胺。这些反应代表了稀有类别的反应性中间体即酰基锂衍生物和ynolates的生成和用于控制其反应性的独特途径。