Synthesis and Properties of Monocyclic 5<i>H</i>-1,2-Oxathioles (Cyclic<i>α</i>,<i>β</i>-Unsaturated Sulfenic Acid Esters)
作者:Yutaka Ono、Yoshiaki Sugihara、Akihiko Ishii、Juzo Nakayama
DOI:10.1246/bcsj.76.613
日期:2003.3
2,5,5-Trimethyl-3-hexyn-2-ol was successively treated with NaH and SCl2 in Et2O to provide 3-t-butyl-4-chloro-5,5-dimethyl-5H-1,2-oxathiole (1b), a class of α,β-unsaturated sulfenic acid ester, in 74% yield. Several S-unoxidized 5H-1,2-oxathioles were synthesized in similar ways. Analysis by cyclic voltammetry uncovered that the oxidation potentials of 1b, 3-(1-adamantyl)-4-chloro-5,5-dimethyl-5H-1
2,5,5-Trimethyl-3-hexyn-2-ol 在 Et2O 中依次用 NaH 和 SCl2 处理,得到 3-t-丁基-4-氯-5,5-二甲基-5H-1,2-oxathiole( 1b),一类α,β-不饱和次磺酸酯,产率为74%。以类似的方式合成了几种 S-未氧化的 5H-1,2-氧杂硫醇。循环伏安法分析发现 1b、3-(1-adamantyl)-4-chloro-5,5-dimethyl-5H-1,2-oxathiole (1c) 和 4-chloro-5,5- 的氧化电位二甲基-3-苯基-5H-1,2-氧杂硫醇 (1d) 分别为 +0.69、+0.68 和 +0.78 V,低于硫化物(苯硫醚,+0.97 和二甲硫醚,+1.09 V) ,并且也低于无环次磺酸酯(苯次磺酸乙酯,+0.90 V)。1c 在沸腾的甲苯中热解得到 2-(1-金刚烷基)-3-氯-4-甲基噻吩,产率为 81%。