Nickel-Catalyzed Cross-Coupling Reactions of 4-Mesylcoumarins with Aryl Halides: Facile Synthesis of 4-Substituted Coumarins
作者:Guo-Qiang Lin、Jian-Guang Lei、Ming-Hua Xu
DOI:10.1055/s-2004-832818
日期:——
nickel-catalyzed cross-couplingreaction between 4-mesylcoumarins and arylhalides was developed to give a number of 4-arylcoumarins in good yield under mild conditions. Unlike the previously reported coupling examples, this new method allows the direct cross-coupling of 4-mesylcoumarins with aryl- or vinyl halides in the NiCl 2 (PPh 3 ) 2 /PPh 3 /Zn/toluene system. This has greatly facilitated the synthesis of