A Novel Method for Furan Annelation by the Regioselective Acylation of Allylic Sulfides<i>via</i>α-Silyl Intermediates
作者:Kunio Hiroi、Hiroyasu Sato
DOI:10.1055/s-1987-28081
日期:——
Aluminum chloride-catalyzed acylations of allylic phenyl sulfides 3 with acid chlorides 5 were carried out via α-silyl intermediates 4 to give γ-acylated vinylic sulfides 6 with complete regioselectivity. Treatment of the γ-acylated compounds with concentrated sulfuric acid in refluxing benzene led to the formation of α-phenylthiofurans 7, which on reductive desulfurization with Raney nickel afforded various furan derivatives 8.
在氯化铝催化下,烯丙基苯基硫化物 3 与酸性氯化物 5 通过δ-硅中间体 4 发生酰化反应,从而得到δ-酰化的乙烯基硫化物 6,且具有完全的区域选择性。在回流苯中用浓硫酸处理δ-酰化化合物,可生成δ-苯硫基呋喃 7,再用雷尼镍进行还原脱硫,可得到各种呋喃衍生物 8。