A Facile Synthesis of 7,8-DI Aryl Coumarino and Flavano Benzo-Thiophenes
摘要:
The key step for the synthesis of 7-hydroxy 2,3-diarylsubstititted benzothiophenes 5a-f by starting from substituted 2-aryl-2-((2-methoxy phenyl)thio)acetophenones 3a-f as at? intermediate, consists of a Friedel-Crafts cyclization followed by demethylation by Lewis acids like BF3OEt2 and AlCl3 in DCM.
A Facile Synthesis of 7,8-DI Aryl Coumarino and Flavano Benzo-Thiophenes
摘要:
The key step for the synthesis of 7-hydroxy 2,3-diarylsubstititted benzothiophenes 5a-f by starting from substituted 2-aryl-2-((2-methoxy phenyl)thio)acetophenones 3a-f as at? intermediate, consists of a Friedel-Crafts cyclization followed by demethylation by Lewis acids like BF3OEt2 and AlCl3 in DCM.
A benzo[b]thiophene synthesis by Rh‐catalyzedthree‐component coupling reaction of arylboronic acids, alkynes, and elemental sulfur (S8) is developed. A notable feature of this protocol is that the thienannulation (thiophene annulation) proceeds with high regioselectivity via the sequential alkyne insertion, C−H activation, and then sulfur atom transfer to the metallacycle intermediate. In a similar
开发了通过Rh催化的芳基硼酸,炔烃和元素硫(S 8)的三组分偶联反应合成苯并[ b ]噻吩。该协议的一个显着特征是,噻吩环化(噻吩环化)通过顺序的炔烃插入,CH活化以及随后的硫原子转移至金属环中间体而以高区域选择性进行。可以类似的方式,由母体联芳基硼酸和S 8合成二苯并噻吩。