Eserethole of formula ##STR1## is prepared from 1,3-dimethyl-5-hydroxy-oxindole compound II which is acylated in the first step to obtain 1,3-dimethyl-5-acyloxyoxindole (III). The product is reacted with chloroacetonitrile to obtain 1,3-dimethyl-3-cyanomethyl-5-acyloxy-oxindole (IV). The 5-acyloxy group is hydrolyzed and the hydroxy group is ethoxylated with ethyl halides or sulfate. Then the product is cyclized by treatment with sodium bis-(methoxy-ethoxy)aluminum hydride, to give O-ethyl-nor-eseroline (VI) and the compound is methylated to give eserethole (VII).
公式##STR1##的Eserethole是从1,3-二甲基-5-羟基-
恶唑酮化合物II制备而成,该化合物在第一步中被酰化以获得1,3-二甲基-5-酰氧基
恶唑酮(III)。 该产物与
氯乙腈反应,得到1,3-二甲基-3-
氰甲基-5-酰氧基
恶唑酮(IV)。 5-酰氧基团被
水解,羟基被乙基卤化物或
硫酸酯乙基化。 然后,该产物通过与双-(甲氧基乙氧基)铝氢化
钠处理进行环化,得到O-乙基-去氧紫杉碱(VI),该化合物被甲基化以得到Eserethole(VII)。