A method of preparing a tetrabenazine compound (TBZ compound) having structure I comprising the steps of reacting a nucleophilic alkenyl species with aldehyde compound II and oxidizing the resultant allylic alcohol to provide enone III. The protecting group P
1
on the tetrahydroisoquinoline nitrogen is removed and the resultant deprotected intermediate is induced to undergo an amino cyclization reaction to provide a product TBZ compound having structure I. The method may be used to prepare either enantiomeric form of tetrabenazine; (+)-tetrabenazine or (−)-tetrabenazine. Alternatively the method may be adapted to provide a mixture enriched in one tetrabenazine enantiomer, a racemic mixture, or a diastereomeric mixture of tetrabenazine compounds. In addition, the present invention provides novel synthetic intermediate compositions which may be used to prepare either or both enantiomers of tetrabenazine, derivatives of tetrabenazine, and analogs of tetrabenazine.
一种制备结构I的四
苯乙酸甲酯化合物(T
BZ化合物)的方法,包括以下步骤:将亲核烯基物种与醛化合物II反应,并将产生的
烯丙醇氧化以提供烯酮III。去除
四氢异喹啉氮上的保护基P1,并使去保护的中间体发生
氨基环化反应以提供具有结构I的T
BZ化合物。该方法可用于制备四
苯乙酸甲酯的两种对映体形式;(+)-四
苯乙酸甲酯或(-)-四
苯乙酸甲酯。另外,该方法可被改进以提供富含一种四
苯乙酸甲酯对映体、一个消旋混合物或四
苯乙酸甲酯化合物的非对映异构体混合物。此外,本发明提供了新型合成中间体组合物,可用于制备四
苯乙酸甲酯的一个或两个对映体、四
苯乙酸甲酯的衍
生物和四
苯乙酸甲酯的类似物。