Palladium-Catalyzed Intramolecular
Biaryl Coupling: A Highly Efficient Avenue for Benzannulated
Pyranoquinolines and Julolidine Derivatives
作者:K. Majumdar、Abu Taher、Pradip Debnath
DOI:10.1055/s-0028-1083363
日期:——
efficient route to the synthesis of benzannulated pyranoquinolines has been accomplished via palladium-catalyzed intramolecular aryl-aryl cross-coupling reactions. The coupling reactions proceeded smoothly under ligand-free conditions with the catalytic system Pd(OAc)2/Cs2CO3/TBAB in high yields. Halogen-reduced product was not obtained in optimum reaction conditions. Regioselective synthesis of 5,6-dihydro-4H
通过钯催化的分子内芳基-芳基交叉偶联反应,已经实现了一种新的合成苯并吡喃喹啉的有效途径。偶联反应在无配体条件下用催化体系Pd(OAc)2 / Cs 2 CO 3 / TBAB进行,收率高。在最佳反应条件下无法获得减少卤素的产物。还描述了5,6-二氢-4 H,8 H-吡啶并[3,2,1- de ]菲啶的区域选择性合成。在后一种情况下,已经观察到碱(Ag 2 CO 3)对转化效率的显着影响。 联芳基偶联-Heck反应-分子内环化-钯催化剂-吡喃喹啉-二氢吡啶并菲啶