Enantioselective Synthesis of Medium‐Sized Lactams via Chiral α,β‐Unsaturated Acylammonium Salts
作者:Guowei Kang、Masaki Yamagami、Sreekumar Vellalath、Daniel Romo
DOI:10.1002/anie.201802483
日期:2018.5.28
challenging to prepare, especially in optically active form. A Michael addition/proton transfer/lactamization organocascade process is described that delivers medium‐sized lactams, including azepanones, benzazepinones, azocanones, and benzazocinones, in high enantiopurity through the intermediacy of chiral α,β‐unsaturated acylammonium salts. An unexpected indoline synthesis was also uncovered, and the benzazocinone
中型内酰胺是在多种生物活性化合物和天然产物中发现的重要结构基序,但制备难度很大,尤其是以光学活性形式存在。描述了一种迈克尔加成/质子转移/内酰胺化有机级联过程,该过程通过手性α,β-不饱和酰基salts盐的中间产物以高对映体纯度输送中等大小的内酰胺,包括a庚酮,苯并enza庚酮,偶氮烷酮和苯并偶氮酮。还发现了意外的二氢吲哚合成,并将苯并偶氮酮骨架转化为其他复杂的杂环衍生物,包括螺戊二酰亚胺,异喹啉酮和δ-内酯。