Reaction of PhSeCl or PhSCl with 2,3-Allenoic Acids: An Efficient Synthesis of β-Organoselenium or β-Organosulfur Substituted Butenolides
作者:Shengming Ma、Feng Pan、Xueshi Hao、Xian Huang
DOI:10.1055/s-2003-43377
日期:——
β-Organoselenium or β-organosulfur-substituted butenolides were prepared via the electrophilic cyclization of 2,3-allenoic acids with PhSeCl or PhSCl.
The efficient copper-catalyzed sulfenylation and selenylation of 2,3-allenoic acids with disulfides or diselenides were developed, respectively. These reactions proceeded through tandem radical addition/intramolecular cyclization processes, affording a series of 4-sulfenylated and 4-selenylated butenolides in moderate to excellent yields. Moreover, 4-sulfonylated butenolides could also be obtained