申请人:——
公开号:US20040171849A1
公开(公告)日:2004-09-02
The present invention provides an efficient, simple, and commercially advantageous process for producing optically active azetidine-2-carboxylic acid, which is an important material for medicines.
The process includes the steps of halogenating an optically active N-protected 4-amino-2-hydroxybutyric acid following inversion of the configuration to produce an optically active N-protected 4-amino-2-halobutyryl halide; hydrolyzing the halide; deprotecting the amino group of the hydrolyzed product to produce an optically active 4-amino-2-halobutyric acid; cyclizing the product in an alkaline aqueous solution; and then protecting the amino group of the cyclized product to produce an optically active N-protected azetidine-2-carboxylic acid.
The present invention also provides an optically active N-protected 4-amino-2-halobutyryl halide represented by general formula (2):
1
(wherein P represents a protective group for the primary amino group; * indicates that the carbon atom is asymmetric; and each of X and Y independently represents a halogen atom), which is useful for producing the optically active azetidine-2-carboxylic acid.
本发明提供了一种高效、简单且商业上优越的生产光学活性的氮保护的4-氨基-2-羟基丁酸卤代物的方法,该物质是重要的药物原料。该方法包括以下步骤:对光学活性的氮保护的4-氨基-2-羟基丁酸进行取向反转后卤代化,以生成光学活性的氮保护的4-氨基-2-卤代丁酰卤化物;水解卤代物;去除水解产物的氨基保护基,生成光学活性的4-氨基-2-卤代丁酸;在碱性水溶液中环化产物;然后保护环化产物的氨基基团,生成光学活性的氮保护的2-氮杂环-2-羧酸。本发明还提供了一种通式(2)所表示的光学活性的氮保护的4-氨基-2-卤代丁酰卤化物:1(其中P表示主要氨基保护基;*表示碳原子是不对称的;X和Y各自独立表示卤素原子),该化合物有助于生产光学活性的2-氮杂环-2-羧酸。