The intermolecular cyclopropanation of 2‐aryl and 2‐styryl substituted ethenesulfonyl fluorides with active cyano‐containing methylenecompounds was described. This reaction proceeds via carbon‐sulfur bond cleavage under metal‐free conditions in up to 99% yield, affording a variety of nitrile‐substituted cyclopropanes with high diastereoselectivity.
Hypoiodite-Mediated Catalytic Cyclopropanation of Alkenes with Malononitrile
作者:Akira Yoshimura、T. Nicholas Jones、Mekhman S. Yusubov、Viktor V. Zhdankin
DOI:10.1002/adsc.201400627
日期:2014.11.3
AbstractAn efficient synthetic procedure for dicyano‐cyclopropanation of alkenes using catalytic amounts of molecular iodine as a precatalyst and tert‐butyl hydroperoxide (TBHP) as a terminal oxidant under mild conditions has been developed. This catalytic reaction works especially well for the aryl‐substituted double bond affording products of cyclopropanation in high yields. A catalytic cycle based on the generated in situ hypoiodite species has been proposed.magnified image