A process for synthesis of a compound of the formula: ##STR1## said process comprising the steps of (a) reacting 4-bromomethyl-7-methoxy coumarin with a malonic ester under conditions sufficient to achieve condensation of the ester to give the monoalkylated (2-bis(carbalkoxy)-2-R.sub.1 -1-ethyl) derivative; (b) removing one of the carbalkoxy groups from the product of step (a); (c) demethylation of the product of step (b) to give the 7-hydroxycoumarin compound; and (d) chemically modifying the remaining ester to yield a desired R.sub.2.
一种合成化合物的方法,该化合物的式为:##STR1## 该方法包括以下步骤:(a)在足够的条件下反应4-
溴甲基-7-甲氧
香豆素与
丙二酸酯,以使酯缩合反应形成单烷基化的(2-双(碳酰氧基)-2-R.sub.1-1-乙基)衍
生物;(b)从步骤(a)的产物中去除一个碳酰氧基;(c)脱甲基化步骤(b)的产物以得到7-羟基
香豆素化合物;(d)
化学修饰剩余的酯基以产生所需的R.sub.2。