Novel synthetic routes to thienocarbazoles via palladium or copper catalyzed amination or amidation of arylhalides and intramolecular cyclization
作者:Isabel C.F.R Ferreira、Maria-João R.P Queiroz、Gilbert Kirsch
DOI:10.1016/s0040-4020(02)00904-3
日期:2002.9
thienocarbazoles. Other method of intramolecular cyclization of diarylamines based on the reoxidation of the Pd(0) formed by Cu(OAc)2, avoiding the use of stoichiometric amounts of Pd(OAc)2, gave thienocarbazoles in a moderate yield, including a ring A methoxylated compound. An attempt to combine palladium and copper catalyses in a ‘one pot’ reaction of amination and intramolecular cyclization gave as major product
进行钯或铜催化的胺化或酰胺化反应以获得噻吩并咔唑的二芳基胺和二芳基乙酰胺前体。在已知邻位卤代二苯胺的咔唑条件下,邻溴二芳基胺未环化为相应的噻吩并咔唑的事实使我们获得了一种钯催化的分子内环化反应的高效方法,其中邻卤代二芳基乙酰胺N脱保护为噻吩并咔唑。基于由Cu(OAc)2形成的Pd(0)的再氧化避免二芳基胺分子内环化的其他方法,避免使用化学计量的Pd(OAc)2得到适量产率的噻吩并咔唑,包括环A甲氧基化化合物。尝试在胺化和分子内环化的“一锅法”反应中结合钯和铜催化剂,以低收率得到N-苯并[ b ]噻吩取代的咔唑和所需的噻吩并咔唑作为主要产物。