Stereoselective Synthesis of 2,4-Disubstituted Thiochromans Using the Supported Reagent System ‘Na<sub>2</sub>CO<sub>3</sub>/SiO<sub>2</sub>-PPA/SiO<sub>2</sub>’
作者:Tadashi Aoyama、Kazuyuki Okada、Hideaki Nakajima、Takuo Matsumoto、Toshio Takido、Mitsuo Kodomari
DOI:10.1055/s-2007-967935
日期:2007.2
A simple and efficient method has been developed for the stereoselective synthesis of 2,4-disubstituted thiochromans from arylthiols and α,β-unsaturated aldehydes by using an acid- and a base-supported reagent system, Na 2 CO 3 /SiO 2 -PPA/SiO 2 . Michael addition of arylthiol to α,β-unsaturated aldehydes was promoted by Na 2 CΟ 3 /SiΟ 2 , and then the product was cyclized in the presence of PPA/SiO
开发了一种简单有效的方法,通过使用酸和碱负载的试剂体系 Na 2 CO 3 /SiO 2 -PPA,从芳基硫醇和 α,β-不饱和醛立体选择性合成 2,4-二取代硫色满/SiO 2 。Na 2 CO 3 /SiO 2 促进芳硫醇与α,β-不饱和醛的迈克尔加成反应,产物在PPA/SiO 2 存在下进行环化。