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 intramolecularcyclopropanation 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
The intramolecularcyclopropanation of various trans-allylic diazoacetates and alkenyl diazoketones has been achieved with excellent enantioselectivities of up to 98% ee and in quantitative yields by using a water-solubleruthenium(II)/hydroxymethyl(phenyl)oxazoline catalyst in a water/ether biphasic medium. The catalyst could be reused at least five times.