syn -2,3-Disubstituted-2,3-dihydro-1,4-benzoxathiin rings: preparation from quinone ketals and 2-mercaptoethanols
作者:Peter G. Dormer、Amude M. Kassim、Johnnie L. Leazer、Fengrui Lang、Feng Xu、Kimberly A. Savary、Edward G. Corley、Lisa DiMichele、Jimmy O. DaSilva、Anthony O. King、David M. Tschaen、Robert D. Larsen
DOI:10.1016/j.tetlet.2004.05.047
日期:2004.7
A general method for the preparation of syn-2,3-disubstituted-2,3-dihydro-1,4-benzoxathiin rings from 2-mercaptoethanols and quinone ketals is presented. This ring system is produced by Michael addition of a 2-mercaptoethanol to a quinone ketal, followed by cyclization of the initial Michael adduct, and subsequent aromatization to afford a syn-2,3-disubstituted-1,4-benzoxathiin in fair to good chemical
提出了一种由2-巯基乙醇和醌缩酮制备syn -2,3-二取代-2,3-二氢-1,4-苯并黄嘌呤环的一般方法。该环系统是由Michael加成2-巯基乙醇至醌缩酮的产生,随后由初始迈克尔加成物的环化,以及随后的芳构化,得到顺式在公平-2,3-二取代-1,4- benzoxathiin良好化学收率。几个手性顺式-2,3-二取代的-2,3-二氢-1,4- benzoxathiin从对映体富集2- mercaptoethanols此方法制备的环。没有观察到对映体纯度的损失。