A general asymmetric route to both enantiomers of polysphorin has been developed. The route utilizes polymer-supported reagents, catalysts and scavengers to minimise the need for aqueous work-up and chromatography. This includes application of a method to scavenge 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ) and a “catch-and-release” procedure to extract the resultant diol following Sharpless asymmetric dihydroxylation. A novel enzymatic selective protection and investigations of a new asymmetric dihydroxylation using microencapsulated osmium tetroxide were also investigated during the course of this study.
已经开发出一种通用的非对称路线来合成聚
硫磷素的两种对映异构体。该路线利用聚合物支持的试剂、催化剂和清除剂,以最小化对
水洗和色谱的需求。这包括应用一种方法来清除
2,3-二氯-5,6-二氰基-1,4-苯醌(
DDQ),以及一种“捕获-释放”程序,用于在夏普莱斯不对称双羟基化反应后提取所得的双醇。此外,还研究了一种新型酶促选择性保护方法,并在研究过程中探讨了使用微封装
四氧化锇的新型不对称双羟基化反应。