Improve Method for Synthesis of 4-Thioaryl-2,3,4-trihydro-1-benzothiopyrans: Acid-induced Stereoselective Intermolecular Cycloaddition of α,β-Unsaturated Aldehydes with Arenethiols
作者:Yoshio Ishino、Masatoshi Mihara、Hidehito Kawai
DOI:10.1055/s-2001-16071
日期:——
A catalytic amount of acids catalyzed reaction of α,β-unsaturated aldehydes with arenethiols in 1,2-dichloroethane brought about intermolecular cycloaddition to give the corresponding 4-thioaryl-2,3,4-trihydro-1-benzothiopyrans (thiochromans) in good to excellent yield. These reactions are assumed to proceed through allylic cationic intermediates generated in site.
少量酸催化的反应将α,β-不饱和醛与芳烃硫醇在1,2-二氯乙烷中进行,促使分子间环加成,生成相应的4-硫芳基-2,3,4-三氢-1-苯硫吡喃(硫克朗)并获得良好至优异的产率。这些反应假定是通过现场生成的烯丙基阳离子中间体进行的。