由吲哚和5-甲氧基吲哚合成了一系列2-和3-芳基取代的吲哚和两个1,3,4,5-四氢吡喃并[4,3- b ]吲哚。使用镁化然后碘化由1-(苯磺酰基)吲哚衍生物合成2-芳基吲哚。然后将2-碘代化合物进行Suzuki-Miyaura反应。另外,使用Suzuki-Miyaura反应由相应的3-溴吲哚制备3-芳基吲哚。1,3,4,5-四氢吡喃并[4,3- b ]吲哚也由1-(苯磺酰基)吲哚通过镁化然后用烯丙基溴处理而合成。然后将产物转化为[2-烯丙基-1-(苯磺酰基)-1 H-吲哚-3-基]甲醇,将其暴露于Hg(OAc)2和NaBH4得到四氢吡喃并[4,3- b ]吲哚。许多2-和3-芳基吲哚显示出值得注意的抗菌活性,化合物13a对革兰氏阳性微生物蜡样芽胞杆菌显示出最显着的活性(3.9μg/ mL)。
Palladium-Catalyzed Direct C-2 Arylation of Indoles with Aryl Halides in Aqueous Medium
作者:Chun Cai、Guo-ping Lu
DOI:10.1055/s-0032-1317702
日期:——
A newly developed, efficient catalytic system for direct C2-arylation of indoles with aryl halides in aqueous medium under mild conditions (80 °C) is reported. These procedures are free of toxic solvents, and exhibit improved yields and high chemo- and regioselectivity.