Treatment of a series of 4-sulfanyl-1,3-diols with toluene-p-sulfonyl chloride and triethylamine in dichloromethane gives substituted 1,2-oxathianes as single diastereoisomers in high yield by cyclisation with formation of a S–O bond. The cyclisation occurs efficiently and the fate of each stereogenic centre (four in all) of the newly formed oxathiane ring is investigated.
                                    在
二氯甲烷中用
甲苯-对
磺酰氯和
三乙胺处理一系列 4-
硫烷基-1,3
-二醇,通过环化形成 S-O 键,以高产率得到单一非对映异构体形式的取代 1,2-氧杂
环己烷。环化有效发生,并研究了新形成的氧噻烷环的每个立体中心(总共四个)的命运。