A Michael Route to Acetals and Thioacetals: Preparation of Acetals (Thioacetals) of 2-Sulfonylacetaldehyde from Alkynyl and Other Unsaturated Aryl Sulfones
作者:Sergio Cossu、Ottorino De Lucchi、Fabrizio Fabris、Roberto Ballini、Giovanna Bosica
DOI:10.1055/s-1996-4406
日期:1996.12
A simple protocol for the direct transformation of arylsulfonylalkynes 1, (Z)- and (E)-1,2-bis(phenylsulfonyl)ethylene (2), and (E)-1-chloro-2-phenylsulfonylethylene (3) into the acetals or thioacetals of acetyl sulfones is presented. It engages the NaH-catalyzed reaction of an alcohol or a thiol with 1-3 at room temperature for 2-12 hours. Emphasis is given to enantiopure C 2 symmetric diols for the production of chiral building blocks to be used in asymmetric synthesis.
本文介绍了将芳基磺酰基炔 1、(Z)- 和 (E)-1,2- 双(苯磺酰基)乙烯 (2) 以及 (E)-1-chloro-2-phenylsulfonylethylene (3) 直接转化为乙酰砜的乙醛或硫代乙醛的简单方案。它涉及醇或硫醇与 1-3 在室温下 2-12 小时的 NaH 催化反应。重点是对映纯 C 2 对称二元醇,以生产用于不对称合成的手性构件。