Olefin cyclopropanation with aryl diazocompounds upon catalysis by a dirhodium(II) complex
作者:Mirella Verdecchia、Cristina Tubaro、Andrea Biffis
DOI:10.1016/j.tetlet.2011.01.002
日期:2011.3
A dirhodium(II) complex with N-perfluorooctylsulfonylprolinate ligands is found to catalyze the cyclopropanation of olefins with simple aryl diazomethanes. In contrast to previously reported dirhodium(II) catalysts, the present complex works well not only with very electron-rich olefins such as enol ethers, but also with styrenes. Consequently, the present catalyst allows to prepare functionalized diarylcyclopropanes in moderate yields with good diastereoselectivity for the cis product, whereas the enantioselectivity of the reaction appears negligible. (C) 2011 Elsevier Ltd. All rights reserved.