Stereoselective Synthesis of Exocyclic Tetrasubstituted Vinyl Halides via Ru-Catalyzed Halotropic Cycloisomerization of 1,6-Haloenynes
作者:Barry M. Trost、Christopher A. Kalnmals
DOI:10.1021/acs.orglett.7b00879
日期:2017.5.5
Herein, a ruthenium-catalyzed cycloisomerization that transforms 1,6-haloenynes into 5-membered carbo- and heterocycles that bear exocyclic, stereodefined, tetrasubstituted vinylhalides is reported. The reaction is insensitive to air and water, tolerates a variety of functional groups, and proceeds with good to excellent stereoselectivity and yield.
A new route to homochiral trans-disubstituted cyclopentanes
作者:Samuel G. Levine、Mary Pat Bonner
DOI:10.1016/s0040-4039(01)80503-7
日期:1989.1
Asymmetric epoxidation of cyano-substituted allylic alcohols gave epoxides of high optical purity. Subsequent base-promoted cyclization produced diastereomerically pure cyclopentane derivatives in moderate yield.