Process for the preparation of a taxol intermediate comprising contacting an alcohol with an oxazinone having the formula: ##STR1## wherein R.sub.1 is aryl, substituted aryl, alkyl, alkenyl, or alkynyl; R.sub.2 is hydrogen, ethoxyethyl, 2,2,2-trichloroethoxymethyl or other hydroxyl protecting group; and R.sub.3 is aryl, substituted aryl, alkyl, alkenyl, or alkynyl; the contacting of said alcohol and oxazinone being carried out in the presence of a sufficient amount of an activating agent under effective conditions to cause the oxazinone to react with the alcohol to form a .beta.-amido ester which is suitable for use as an intermediate in the synthesis of taxol.
制备
紫杉醇中间体的过程包括将醇与具有以下结构式的
噁唑酮接触:##STR1## 其中R.sub.1为芳基、取代芳基、烷基、烯基或炔基;R.sub.2为氢、乙氧基乙基、2,2,2-三
氯乙氧甲基或其他羟基保护基;R.sub.3为芳基、取代芳基、烷基、烯基或炔基;在存在足够量的活化剂的情况下,在有效条件下进行醇和
噁唑酮的接触,使
噁唑酮与醇发生反应形成适用于用作
紫杉醇合成中间体的β-酰胺酯。