Synthesis of vinyl sulfides and thioethers <i>via</i> a hydrothiolation reaction of 4-hydroxydithiocoumarins and arylacetylenes/styrenes
作者:Santa Mondal、Sabina Yashmin、Abu Taleb Khan
DOI:10.1039/d1ob01729b
日期:——
The synthesis of vinyl sulfides (3a–m) and thioethers (7a–k), exclusive Markovnikov products, is reported by a copper(I) iodide catalyzed regioselective hydrothiolation reaction of terminal alkynes/alkenes and 4-hydroxydithiocoumarins. However, anti-Markovnikov hydrothiolation products (5a–f) were obtained in the case of 2-ethynylpyridine, with exclusive Z selectivity in good yields. The important
通过碘化铜 ( I ) 催化末端炔烃/烯烃和 4-羟基二硫代香豆素的区域选择性氢硫基化反应合成乙烯基硫化物 ( 3a-m ) 和硫醚 ( 7a-k ),这是 Markovnikov 独有的产物。然而,在 2-乙炔基吡啶的情况下,获得了抗马尔可夫尼科夫氢硫醇化产物 ( 5a-f ),具有高产率的独家Z选择性。该协议的重要方面是没有昂贵的金属配合物和添加剂作为配体、温和的反应条件、高区域选择性、良好的收率和更短的反应时间。