Synthesis of Enantiomerically Pure Thiocrown Ethers Derived from 1,1‘-Binaphthalene-2,2‘-diol
作者:H. Thijs Stock、Richard M. Kellogg
DOI:10.1021/jo952107o
日期:1996.1.1
Synthetic methodology is given for the preparation of two different types of thiocrown ethers from optically pure 1,1'-binaphthalene-2,2'-diol (10). The conceptually simplest approach starts from optically pure 10 itself, which is alkylated (4 equiv of K(2)CO(3) in DMF at 110 degrees C) with 2-chloroethanol followed by mesylation to provide 2,2'-bis(2-(mesyloxy)ethoxy)-1,1'-binaphthyl (14). When allowed
给出了从光学纯的1,1'-联萘-2,2'-二醇(10)制备两种不同类型的硫代冠醚的合成方法。从概念上讲,最简单的方法是从光学纯的10本身开始,将其与2-氯乙醇进行烷基化(在DMF中于110摄氏度时在DMF中为4当量的K(2)CO(3)),然后进行甲磺酰化,以提供2,2'-bis(2 -(甲甲氧基)乙氧基)-1,1'-联萘基(14)。当使其与乙烷-1,2-二硫醇,丙烷-1,3-二硫醇,1,4,7-三噻庚烷,1,4,8,11-四硫十一烷,2,2-二甲基丙烷-1,3-二硫醇反应时,2-(巯基甲基)-1-丙烯-3-硫醇和1,2-苯二硫醇在Cs(2)CO(3)在60°C的DMF中存在时,相应的硫冠醚22-25、28、30 ,以30-54%的产率形成32。进行测试反应以证实在这些条件下在烷基化过程中不发生外消旋化。在相似的条件下,将光学纯的10与四氢吡喃基(THP)保护的3-氯丙醇的反应进行得较慢,但反应较干净。除去THP保护基,得到2