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-coupling reaction between 4-mesylcoumarins and aryl halides 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
开发了一种新的高效镍催化的 4-甲基香豆素和芳基卤化物之间的交叉偶联反应,在温和的条件下以良好的收率得到了许多 4-芳基香豆素。与之前报道的偶联实例不同,这种新方法允许在 NiCl 2 (PPh 3 ) 2 /PPh 3 /Zn/甲苯系统中将 4-甲磺酰香豆素与芳基或乙烯基卤化物直接交叉偶联。这极大地促进了生物学上有用的 4-取代香豆素的合成。