Catalyst-Controlled Regio- and Stereoselective Bromolactonization with Chiral Bifunctional Sulfides
作者:Ayano Tsuchihashi、Seiji Shirakawa
DOI:10.1055/s-0037-1610716
日期:2019.9
Highlyregioselective 5-exo bromolactonizations of stilbene-type carboxylic acids bearingelectron-withdrawing substituents are achieved for the first time via the use of chiral bifunctional sulfide catalysts possessing a urea moiety. The chiral phthalide products are obtained in moderate to good enantioselectivities as the result of 5-exo cyclizations.