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。