Palladium-catalysed coupling of the 4-chloro- or 4-bromo-coumarins 1–4 with arylboronic acids 5–13 under the Suzuki reaction conditions constitutes an efficient access to 4-arylcoumarins. These 4-arylcoumarins can also be obtained in good yields (70–97%) by treatment of 4-trifluoromethyl-sulfonyloxycoumarins 35–38 with arylboronic acids under modified Suzuki reaction conditions, involving the use of copper(I) iodide as a co-catalyst.
在铃木反应条件下,
钯催化 4-
氯或 4-
溴香豆素 1-4 与芳基
硼酸 5-13 的偶联反应是获得 4-芳基
香豆素的有效途径。在改良的铃木反应条件下,使用
碘化
铜(I)作为辅助催化剂,将 4-三
氟甲基-磺酰氧基
香豆素 35-38 与芳基
硼酸进行处理,也能以良好的收率(70-97%)获得这些 4-芳基
香豆素。