An Expedient Procedure for the Synthesis of Benzo[4,5]silolo[2,3-<i>b</i>]thiophenes and Related Systems
作者:Susanne Bähr、Hiroaki Ogasawara、Shigehiro Yamaguchi、Martin Oestreich
DOI:10.1021/acs.organomet.7b00619
日期:2017.10.23
benzosiloles is accomplished by 2-fold metalation of benzo[b]thiophenes substituted at C3 with ortho-brominated aryl groups followed by electrophilic substitution with dichlorosilanes. The method relies on the innate acidity of the C(sp2)–H bond at C2 of benzo[b]thiophenes and the halogen–metal exchange of the proximal C(sp2)–Br bond. The related indole- and benzofuran-annulated systems are also accessible
各种噻吩稠合的苯并甲酚的直接组装是通过在C3处用邻溴化的芳基进行2倍苯并[ b ]噻吩的2倍金属化,然后用二氯硅烷进行亲电取代来实现的。该方法依赖于苯并[ b ]噻吩的C2处C(sp 2)-H键的固有酸度和近端C(sp 2)-Br键的卤素-金属交换。也可以使用相关的吲哚和苯并呋喃环化的系统,但是这些硅烷的化学稳定性较差。还包括噻吩稠合的苯并germol的例子。