Sequential asymmetric dihydroxylation and sulfoxidation of homoallylic sulfides. Stereochemical aspects of the preparation of new trifunctional chiral building blocks
作者:Jacek Skarżewski、Elżbieta Wojaczyńska、Ilona Turowska-Tyrk
DOI:10.1016/s0957-4166(02)00123-4
日期:2002.3
Products with three new stereogenic centers were generated via sequential asymmetric dihydroxylation and sulfoxidation of homoallylic sulfides. The non-racemic homoallylic sulfoxides were prepared using chiral, vanadyl-based catalytic system with e.e. of up to 85%. Subsequently, these compounds were dihydroxylated with AD-mix system and gave products of low d.e.s (up to 40%). Recrystallization of l-diastereomers
通过顺序不对称二羟基化和均烯丙基硫醚的硫氧化,生成了具有三个新的立体异构中心的产品。非手性均烯丙基亚砜是使用手性,基于钒基的催化体系制备的,ee最高可达85%。随后,将这些化合物用AD-mix系统二羟基化,得到低des(最高40%)的产物。1-非对映异构体的重结晶提供了对映体纯的1-苯基-4-苯基亚磺酰基丁烷-1,2-二醇(X射线),它们是新的有用的手性结构单元。在硫上进一步氧化产生1-苯基-4-苯基磺酰基丁烷-1,2-二醇的相应对映体。