作者:Sean M. Maddox、Andrew N. Dinh、Felipe Armenta、Joann Um、Jeffrey L. Gustafson
DOI:10.1021/acs.orglett.6b02650
日期:2016.11.4
overcome the innate para-selectivity of electrophilic phenol chlorination, yielding ortho-chlorinated phenols that are not readily obtainable via canonical electrophilic chlorinations. Conversely, a phosphine sulfide derived from 2,2′-Bis(diphenylphosphino)-1,1′-binaphthyl (BINAP) was found to enhance the innate para-preference of phenol chlorination.
已证明不同的催化剂可以克服或提高底物的固有区域选择性。发现长泽的双硫脲催化剂克服了亲电子苯酚氯化的先天对位选择性,产生了不易通过规范的亲电子氯化获得的邻氯苯酚。相反,硫化膦从2,2'-双(二苯基膦基)-1,1'-联萘(BINAP)衍生的被发现增强先天对苯酚氯化的-preference。