palladacycle-catalyzed decarboxylative coupling of alkynyl carboxylic acids with aryl chlorides was developed. The reaction could proceed smoothly in air within 3 h under optimized reaction conditions (1 mol % of palladacycle, 4 mol % of Xphos, 2.0 equiv of K2CO3 in xylene/H2O), affording the corresponding internal alkynes in mostly good to excellent yields. Remarkably, this result represents the first
开发了一种高效,实用的协议,用于戊四环催化炔基
羧酸与芳基
氯化物的脱羧偶联。在优化的反应条件(1 mol%的Palladacycle,4 mol%的Xphos,2.0当量的K 2 CO 3在二
甲苯/ H 2 O中)下,反应可以在3小时内在空气中平稳进行,从而提供了大部分良好的相应内部
炔烃达到优异的产量。值得注意的是,该结果代表了使用贫电子,电子中性,甚至无活性的位阻富电子的芳基
氯化物作为起始原料的这种脱羧交叉偶联的第一个成功实例。