An Improved Method for Stereoselective Synthesis of (<i>E</i>)-Alkenes via Alkenyldialkylboranes
作者:Masayuki Hoshi、Yuzuru Masuda、Akira Arase
DOI:10.1246/bcsj.59.3985
日期:1986.12
Successive treatments of alkenyldialkylboranes, formed by the reaction of alkynes and sterically hindered dialkylboranes, with alkyllithium and benzenesulfenyl chloride afforded highly pure (E)-alkenes in good or excellent yields.
Nickel-catalyzed geminal dimethylation of allylic cyclic dithioketals. A convenient procedure to form a tert-butyl substituent at the olefinic carbon atom
The insertion of lithiated epoxides into boronic esters followed by thermal syn-elimination provides a stereospecific entry to alkenes. This process avoids transition metals and is amenable to iteration to provide higher substitution patterns.