Diastereoselective Synthesis of β-Lactam-Oxindole Hybrids Through a Three-Component Reaction of Azetidine-2,3-diones, α-Diazo-oxindoles, and Alcohols Catalyzed by [Rh2(OAc)4]
作者:Benito Alcaide、Pedro Almendros、Cristina Aragoncillo、Ricardo Callejo、M. Pilar Ruiz、M. Rosario Torres
DOI:10.1002/ejoc.201101625
日期:2012.4
β-Lactam–oxindole hybrids have been synthesized in good yields in a one-pot procedure through efficient and stereoselective capture of an oxonium ylide with azetidine-2,3-diones. The reaction allows high to moderate control of stereoselectivity, depending on the 3-diazo-oxindole precursor and the hydroxylic compound used. Two new quaternary stereogenic centers were formed; the stereochemistry at the
通过用氮杂环丁烷-2,3-二酮有效和立体选择性地捕获氧鎓叶立德,已经在一锅法中以良好的产率合成了β-内酰胺-羟吲哚杂化物。根据所使用的 3-重氮-羟吲哚前体和羟基化合物,该反应允许对立体选择性进行高到中等控制。形成了两个新的四元立体中心;C-3 季中心的立体化学由 C-4 上的大取代基控制,而相邻的第二季立体中心的立体选择性由 α-重氮-羟吲哚控制。两个四元中心的立体化学已通过单晶 X 射线衍射明确指定。