Preparation of thiochromans<i>via</i>thermal cyclization
作者:Anton W. Jensen、Joan Manczuk、David Nelson、Onalee Caswell、Steven A. Fleming
DOI:10.1002/jhet.5570370619
日期:2000.11
Formation of the thiochroman ringsystem is achieved by a two step synthesis that involves heating 3-thiophenyl-1-propanols or 4-thiophenyl-2-butanols in toluene with catalytic amounts of p-toluenesulfonic acid. The propanols are made by the addition of sulfur stabilized carbanions to styrene oxide, ethylene oxide, propylene oxide, and isobutylene oxide. The carbanions are generated by treatment of