Synthesis of 2,9-dialkylated phenanthro[1,2-b:8,7-b′]dithiophenes via cross-coupling reactions and sequential Lewis acid-catalyzed regioselective cycloaromatization of epoxide
作者:Keita Hyodo、Hikaru Nonobe、Shuhei Nishinaga、Yasushi Nishihara
DOI:10.1016/j.tetlet.2014.05.035
日期:2014.7
Phenanthro[1,2-b:8,7-b′]dithiophene (PDT) was prepared via Suzuki–Miyaura or Negishi cross-coupling of a 2-thienylboron or -zinc compound with 1,4-dibromobenzene, followed by Lewis acid-catalyzed regioselective cycloaromatization of the epoxide. A series of 2,9-dialkylated phenanthro[1,2-b:8,7-b′]dithiophene (PDT) derivatives could also be synthesized in good yields by Suzuki–Miyaura coupling of the brominated
苯并[1,2- b:8,7- b ']二噻吩(PDT)是通过2-噻吩硼或-锌化合物与1,4-二溴苯的Suzuki-Miyaura或Negishi交联制备的,然后用路易斯酸制备催化环氧化物的区域选择性环芳构化。铃木-Miyaura通过引入线性烷基将溴化PDT与烷基硼烷偶联,也可以高收率合成一系列2,9-二烷基化菲咯啉[1,2- b:8,7- b ']二噻吩(PDT)衍生物。取代基。