Functionalization of the 3-Position of Thiophene and Benzo[b]thiophene Moieties by Palladium-Catalyzed CC Bond Forming Reactions using Diazonium Salts
作者:Mónica Raduán、Joaquim Padrosa、Anna Pla-Quintana、Teodor Parella、Anna Roglans
DOI:10.1002/adsc.201100226
日期:2011.8
Matsuda–Heck and Suzuki–Miyaura cross-couplings of 2-methoxycarbonylthiophene-3-diazonium tetrafluoroborate 1 were performed to synthesize a series of thiophene derivatives functionalized in the β-position. Good to excellent yields of the cross-coupling products were obtained using palladium acetate [Pd(OAc)2], a ligandless palladium catalyst, without a base, at room temperature, under aerobic conditions and with
2-甲酯基噻吩-3-重氮四氟硼酸盐的钯催化的松田-的Heck和Suzuki-Miyaura交叉偶联1进行到合成一系列在β位官能噻吩衍生物。使用乙酸钯[Pd(OAc)2 ],一种无配体的钯催化剂,无碱,在室温下,好氧条件下,反应时间短的情况下,可获得良好或优异的交叉偶联产物收率。重氮化和交叉偶联的序列也可以在一锅法中进行,从而避免了噻吩并重氮盐衍生物的分离。此外,2-甲氧基羰基苯并[ b ]噻吩-3-重氮四氟硼酸盐8 通过应用相同的Suzuki-Miyaura优化反应条件也可以有效地芳基化。