Studies of microwave-enhanced Suzuki–Miyaura vinylation of electron-rich sterically hindered substrates utilizing potassium vinyltrifluoroborate
作者:Matthew D. Brooker、Stefan M. Cooper、Dena R. Hodges、Rhiannon R. Carter、Justin K. Wyatt
DOI:10.1016/j.tetlet.2010.10.087
日期:2010.12
The Suzuki–Miyaura cross-coupling of sterically hindered and electron-rich ortho,ortho′-substituted aryl halides with potassium vinyltrifluoroborate utilizing microwave irradiation has been conducted while adjusting solvent ratio, irradiation time, and catalyst loading to find optimal conditions. Coupling of benzyl 3,5-bis(benzyloxy)-4-bromobenzoate leads to a mixture of the desired styrene derivative
利用微波辐射进行空间位阻和富电子邻、邻'-取代芳基卤化物与乙烯基三氟硼酸钾的 Suzuki-Miyaura 交叉偶联,同时调整溶剂比、辐射时间和催化剂负载以寻找最佳条件。3,5-双(苄氧基)-4-溴苯甲酸苄酯的偶联产生所需苯乙烯衍生物和还原产物的混合物。4-溴-1,3,5-三甲氧基苯、4-溴-3,5-二甲氧基苯甲酸甲酯和均三甲苯也被耦合以测试该方法的广度和范围。在这些测试的底物中,只有 4-溴-1,3,5-三甲氧基苯未成功乙烯基化,这被认为是由于该系统的富电子性质。