Enantioselective Cobalt-Catalyzed Preparation of Trifluoromethyl-Substituted Cyclopropanes
作者:Bill Morandi、Brian Mariampillai、Erick M. Carreira
DOI:10.1002/anie.201004269
日期:2011.2.1
Easy access on water: A cobalt‐catalyzed asymmetric preparation of trifluoromethylcyclopropanes has been developed that yields high enantioselectivities with a broad range of styrene substrates (see scheme). The reaction presents a new access to enantioenriched CF3‐containing building blocks.
Iron-Catalyzed Cyclopropanation with Trifluoroethylamine Hydrochloride and Olefins in Aqueous Media: In Situ Generation of Trifluoromethyl Diazomethane
作者:Bill Morandi、Erick M. Carreira
DOI:10.1002/anie.200905573
日期:2010.1.25
Let's avoid the risk! The title transformation has been developed for the synthesis of trifluoromethyl‐substituted cyclopropane derivatives (see scheme). It avoids the preparation of trifluoromethyldiazomethane and merges a number of areas: water as a reaction medium, iron catalysis, and access to reactive intermediates under operationally safe conditions.