Diastereoselective [3 + 1] Cyclization Reaction of Oxindolyl Azaoxyallyl Cations with Sulfur Ylides: Assembly of 3,3′-Spiro[β-lactam]-oxindoles
作者:Hai-Jun Leng、Qing-Zhu Li、Peng Xiang、Ting Qi、Qing-Song Dai、Zhi-Qiang Jia、Chuan Gou、Xiang Zhang、Jun-Long Li
DOI:10.1021/acs.orglett.1c00130
日期:2021.2.19
challenging task in organic synthesis. Herein we designed a novel type of oxindole-based azaoxyallyl cation synthons, which could readily participate in the [3 + 1] cyclization with sulfur ylides. With this protocol, a collection of 3,3-spiro[β-lactam]-oxindoles were facilely produced in up to 94% yield with perfect diastereoselectivity.
氧吲哚和β-内酰胺类由于其独特的生物学重要性而成为有吸引力的结构基序。然而,以3,3'-螺环支架为特征的两个部分的融合是有机合成中的一项艰巨任务。在本文中,我们设计了一种新型的基于羟吲哚的氮杂氧基烯丙基阳离子合成子,该合成子很容易参与硫基化物的[3 +1]环化反应。利用该方案,可以容易地以理想的非对映选择性轻松地以高达94%的产率生产3,3-螺[β-内酰胺]-吲哚的集合。