An efficient synthesis of 4-substituted coumarin derivatives via a palladium-catalyzed Suzuki cross-coupling reaction
作者:Trideep Rajale、Shikha Sharma、Daniel A. Stroud、Daniel K. Unruh、Emily Miaou、Kimberly Lai、David M. Birney
DOI:10.1016/j.tetlet.2014.10.078
日期:2014.12
An efficient Pd-catalyzed Suzuki cross-coupling reaction of sterically crowded 4-chlorocoumarin derivatives with air- and moisture-stable potassium organotrifluoroborates is developed. This methodology has been used to generate a series of novel alkyl, aryl, and vinyl substituted coumarin derivatives in good to excellent yields. The twisted conformation of the vinyl groups in the X-ray crystal structures
开发了一种有效的Pd催化的,空间拥挤的4-氯香豆素衍生物与空气和水分稳定的有机三氟硼酸钾的Suzuki交叉偶联反应。该方法已用于以良好或优异的产率生成一系列新颖的烷基,芳基和乙烯基取代的香豆素衍生物。(2-氧代-4-乙烯基-2 H-铬-3-基)乙酸甲酯(2)和(2-氧代-4-乙烯基-2 H)的X射线晶体结构中乙烯基的扭曲构象-铬烯-3-基)甲基2,2,2-三氯乙酰胺酸酯(3)以及3-(羟甲基)-4-(2-甲氧基苯基)-2 H-铬烯-2-酮(1d)的阻转异构性,是这些加合物中空间拥挤的证据。