[reaction: see text] Alkyl azides react with saturated ketones upon treatment with Lewis acids to afford ring-expansion products through the azido-Schmidt reaction, but this reaction does not proceed when alpha,beta-unsaturated ketones are used. In this study, alkyl azides were reacted with enones in the presence of Lewis acids to give enaminones (vinylogous amides), which formally involve a ring contraction
[反应:见正文]烷基
叠氮化物在用
路易斯酸处理后与饱和酮反应,通过
叠氮基-施密特反应提供扩环产物,但当使用α,β-不饱和酮时,该反应不会进行。在这项研究中,烷基
叠氮化物在
路易斯酸存在下与烯酮反应生成烯胺酮(
乙烯基酰胺),形式上涉及环收缩反应。讨论了该反应的机理和范围。