Unusual Skeletal Rearrangement of Unsaturated Seven-Membered Lactams into Fused Pyrrolidinolactones
作者:Silvia Álvarez、Gema Domínguez、Ana Gradillas、Javier Pérez-Castells
DOI:10.1002/ejoc.201300136
日期:2013.5
Unsaturated ϵ-lactams undergo a novel process involving a skeletal reorganization to give fused pyrrolidine-lactones by reaction with aromatic α-bromo ketones in the presence of 1,4-diazabicyclo[2.2.2]octane and a base. The process involves the formation of an ammonium salt and subsequently a nitrogen ylide, which initiates the rearrangement reaction. This species reduces undesired side-reactions such
不饱和 ϵ-内酰胺经历了一种新的过程,涉及骨架重组,通过与芳香族 α-溴酮在 1,4-二氮杂双环 [2.2.2] 辛烷和碱存在下反应得到稠合吡咯烷内酯。该过程包括形成铵盐和随后的氮叶立德,从而引发重排反应。该物种减少了不需要的副反应,例如双键位移或 Morita-Baylis-Hilman 型过程。所得产物在结构上与类胡萝卜素相关,重排产物中内酯部分的转化为合成这些具有潜在生物活性的天然产物及其衍生物铺平了道路。