Reusable and highly enantioselective water-soluble Ru(II)-<i>Amm</i>-Pheox catalyst for intramolecular cyclopropanation of diazo compounds
作者:Hamada S A Mandour、Yoko Nakagawa、Masaya Tone、Hayato Inoue、Nansalmaa Otog、Ikuhide Fujisawa、Soda Chanthamath、Seiji Iwasa
DOI:10.3762/bjoc.15.31
日期:——
highly enantioselective catalyst for the intramolecular cyclopropanation of various diazo ester and Weinreb amide derivatives was developed. The reactions catalyzed by a water-soluble Ru(II)-Amm-Pheox catalyst proceeded smoothly at room temperature, affording the corresponding bicyclic cyclopropane ring-fused lactones and lactams in high yields (up to 99%) with excellent enantioselectivities (up to
开发了一种可重用和高对映选择性的催化剂,用于各种重氮酯和Weinreb酰胺衍生物的分子内环丙烷化反应。水溶性Ru(II)-Amm- Pheox催化剂催化的反应在室温下顺利进行,从而以高收率(高达99%)提供了相应的双环环丙烷环稠合内酯和内酰胺,并具有出色的对映选择性(高达99) %ee)。在筛选各种催化剂后,具有铵基的Ru(II)-Amm - Pheox配合物被证明对于在水/醚双相介质中的分子内环丙烷化反应至关重要。水溶性催化剂可以重复使用至少六次,而收率和对映选择性几乎没有损失。