hylglycine into proteins is a valuable biological tool. Coumarins are typically accessed via the Pechmann reaction, which requires acidic conditions and lacks substrate flexibility. A Pd-mediated coupling is described between o-methoxyboronic acids and a glutamic acid derived (Z)-vinyl triflate, forming latent coumarins. Global deprotection with BBr3 forms the coumarin scaffold in a single step. This
将荧光的1-(7-羟基
香豆素-4-基)乙基甘
氨酸掺入蛋白质是一种有价值的
生物学工具。
香豆素通常通过Pechmann反应进入,该反应需要酸性条件且缺乏底物的柔韧性。描述了邻甲氧基
硼酸和谷
氨酸衍生的(Z)-
三氟甲磺酸酯之间形成潜在潜伏
香豆素的Pd介导的偶联。用BBr 3进行整体脱保护可在一个步骤中形成
香豆素骨架。这种温和且可扩展的途径产生了五个类似物,包括适合在较低pH值下使用的探针。