The invention discloses a method for preparing a
coumarin derivative. According to the method, the
coumarin derivative shown by formula (I) is prepared by using a compound shown by formula (II) as a
raw material; the synthetic process
route of the
coumarin derivative is simple, feasible and safe, the method is suitable for industrial production, the raw materials are low-
toxicity and economic, and the yield is universally high. The total yield of
isofraxidin is 57.6% and is greater than 47.5% of the existing other synthetic
route, the synthetic process step is shortened, and the process
route is low-
toxicity, environment-friendly and safe; 6,7,8-triethoxycoumarin is synthesized for the first time, the yield is up to 67%, and the synthetic method is simple, convenient, mild in conditions and low in
pollution; the yield of scoparone is 77.4%, few byproducts are produced, the conditions are mild, and the experiment is easy in operation; by using the compound with relatively
low toxicity, the
pollution is low, and the cost is relatively low, so the method is suitable for industrialized production.