Acetylenic esters. Part III. Reactions of thiocarbonyl compounds with methyl propiolate, methyl methylpropiolate, and methyl phenylpropiolate
作者:G. Dallas、J. W. Lown、J. C. N. Ma
DOI:10.1039/j39680002510
日期:——
Non-terminal acetylenic esters react with many thiocarbonyl compounds to form heterocycles or 1 : 1 addition products. Propiolic esters in most cases form isomeric mixtures of dimethyl 3,3′-thiodiacrylates (I). The stereochemical course of the thiolic nucleophilic additions may be controlled for preparative purposes by changes in solvent polarity. All three stereoisomers of (I) have been prepared.
非末端炔属酯与许多硫代羰基化合物反应形成杂环或1:1加成产物。在大多数情况下,丙酸酯形成3,3'-硫代二丙烯酸二甲酯(I)的异构体混合物。为了制备目的,可以通过改变溶剂极性来控制巯基亲核加成的立体化学过程。(I)的所有三种立体异构体均已制备。与顺式-不同,3-(1,1-二甲基-3-苯基-2-异硫脲基)丙烯酸甲酯的反式异构体完全重排为四取代的硫脲。