efficient cascade approach to thiosubstituted benzoxazoles has been developed. The transformation starts with in situ generation of a diazo compound via annulation-triggered electrocyclic opening of the 1,2,3-triazole ring. The subsequent Cu-catalyzed trapping of diazo intermediates by various thiols affords the desired heterocycles in generally good yields of up to 91%. The protocol features very good
已经开发了一种有效的级联方法用于
硫代取代的
苯并恶唑。该转化开始于通过
1,2,3-三唑环的环引发触发的电环开环原位产生重氮化合物。随后的
铜催化的各种
硫醇捕集重氮中间体可提供所需的杂环,收率通常高达91%。该协议具有非常好的官能团耐受性,适用于具有不同电子特性的基材。