Boron Lewis Acid-Catalyzed Regioselective Hydrothiolation of Conjugated Dienes with Thiols
作者:Gautam Kumar、Zheng-Wang Qu、Soumen Ghosh、Stefan Grimme、Indranil Chatterjee
DOI:10.1021/acscatal.9b04647
日期:2019.12.6
tris(pentafluorophenyl)borane, B(C6F5)3, and BF3·Et2O are shown to catalyze the regioselective hydrothiolation of a wide range of terminal 1-aryl-1,3-dienes. In the case of internal 1,3-dienes, B(C6F5)3 is by far the better catalyst than BF3·Et2O. The process features mild reaction conditions, broad scope, and low catalyst loading, and it can be scaled up quickly over a short reaction time. The reactions are rate-limited
报道了用于合成仲和叔烯丙基硫醚的无过渡金属的1,3-二烯氢硫醇化反应。硼路易斯酸三(五氟苯基)硼烷,B(C 6 F 5)3和BF 3 ·Et 2 O已显示出催化范围广泛的末端1-芳基-1,3-二烯的区域选择性氢硫醇化反应。在内部1,3-二烯的情况下,与BF 3 ·Et 2相比,B(C 6 F 5)3是更好的催化剂。O.该工艺的特点是反应条件温和,适用范围广,催化剂用量低,并且可以在较短的反应时间内迅速扩大规模。如高水平DFT计算所示,反应是通过1,3-二烯与硫醇-硼路易斯酸配合物的1-芳基定向质子化,然后将硫化物阴离子转移到所得的烯丙基阳离子上来进行的,从而限制了反应的速率。