A new cinchona alkaloid derived bifunctional tertiary amine-phosphoramide C1e is identified as a highly enantioselective catalyst for Michael addition of both unprotected 3-arylthio- and 3-alkylthiooxindoles to nitroolefins. The phosphoramide moiety of C1e plays an indispensable role in this reaction.
一种新的来源于
奎宁生物碱的双功能三级胺-
磷酰胺C1e被鉴定为对未保护的3-芳基
硫代和3-烷基
硫代氧啶向硝基烯烃的迈克尔加成反应的高立体选择性催化剂。C1e的
磷酰胺部分在该反应中发挥了不可或缺的作用。