A practical route to prepare 4-hydroxycoumarin derivatives functionalized at the C-3 position is described through a catalytic coupling reaction between 4-hydroxycoumarin and a series of substituted benzylic alcohols. The reaction is conducted in the presence of tris(triphenylphosphine)ruthenium(II) dichloride (5 mol%), KOH (0.2 eq.) in tertamyl alcohol under microwave irradiation at 140 °C for 2 hours.
描述了一条通过
4-羟基
香豆素与一系列取代
苄醇之间的催化偶联反应来制备C-3位功能化的
4-羟基
香豆素衍
生物的实用路线。该反应在三(
三苯基膦)二
氯化
钌(II)(5 mol%)、KOH(0.2 eq.)存在下,以叔
戊醇为溶剂,在微波辐射下于140 °C反应2小时进行。