Effective metal-catalyzed benzylations of 4-hydroxycoumarin have been developed. Employing a low amount of a cheap, nontoxic, and air-stable catalyst the 3-alkylated hydroxycoumarins were isolated in high yields after short reaction times. Applying this new methodology two widely used anticoagulants phenprocoumon and coumatetralyl were synthesized applying mild reaction conditions.
已经开发出有效的
金属催化
4-羟基
香豆素苄基化反应。使用少量廉价、无毒且稳定的催化剂,经过短时间反应后,获得了高产率的3-烷基化羟基
香豆素。采用这种新方法,合成了两种广泛使用的抗凝剂苯普鲁孔和
氟克洛络。