申请人:Nippon Kayaku Kabushiki Kaisha
公开号:US04281180A1
公开(公告)日:1981-07-28
A process for producing threo-3-amino-2-hydroxybutanoylaminoacetic acids comprises the steps of allowing to react a starting compound represented by the general formula: ##STR1## wherein R.sub.1 represents a naphthyl or a group of the formula: ##STR2## in which R.sub.6 and R.sub.7 represent individually hydrogen, halogen, amino or a protected amino, hydroxy or a protected hydroxy, a lower alkoxy or a lower alkyl and R.sub.2 represents a protected amino, with a starting compound represented by the general formula: ##STR3## wherein R.sub.3 represents hydrogen or an ester residue, to obtain threo-3-protected amino-2-hydroxy-4-oxobutanoic acid or its ester represented by the general formula: ##STR4## wherein R.sub.1, R.sub.2 and R.sub.3 have the same meanings as above, and then reducing the same into threo-3-protected amino-2-hydroxybutanoic acid or its ester represented by the general formula: ##STR5## wherein R.sub.1, R.sub.2 and R.sub.3 have the same meanings as above, and further converting the above compound into 3-amino-2-hydroxybutanoic acid represented by the general formula: ##STR6## wherein R.sub.2 ' represents amino or a protected amino, thereafter condensing the same, in a conventional manner for forming a peptide coupling, with a compound represented by the general formula: ##STR7## wherein R.sub.4 represents an alkyl having 3-4 carbon atom or 3-guanidinopropyl, while previously protecting as required those groups not relevant to the reaction, and removing the protecting groups for the functional groups to produce threo-3-amino-2-hydroxybutanoylaminoacetic acids represented by the general formula: ##STR8## wherein R.sub.1 and R.sub.4 have the same meanings as above. This invention also provides the compounds represented by the general formula (III) as novel intermediates for the above aimed compounds and a process for producing the intermediates.
一种制备threo-3-氨基-2-羟基丁酰胺基乙酸的方法,包括以下步骤:将由通式表示的起始化合物反应:##STR1## 其中R.sub.1表示萘基或公式的基团:##STR2## 其中R.sub.6和R.sub.7分别表示氢、卤素、氨基或受保护的氨基、羟基或受保护的羟基、低级烷氧基或低级烷基,R.sub.2表示受保护的氨基,与由通式表示的起始化合物反应:##STR3## 其中R.sub.3表示氢或酯基残基,以获得threo-3-受保护氨基-2-羟基-4-酮丁酸或其由通式表示的酯:##STR4## 其中R.sub.1、R.sub.2和R.sub.3具有与上述相同的含义,然后将其还原为threo-3-受保护氨基-2-羟基丁酸或其由通式表示的酯:##STR5## 其中R.sub.1、R.sub.2和R.sub.3具有与上述相同的含义,进一步将上述化合物转化为由通式表示的3-氨基-2-羟基丁酸:##STR6## 其中R.sub.2'表示氨基或受保护的氨基,然后以传统方式缩合,与由通式表示的化合物:##STR7## 其中R.sub.4表示具有3-4个碳原子的烷基或3-鸟氨基丙基,在必要时先保护与反应无关的那些基团,然后去除功能基团的保护基团,以生成由通式表示的threo-3-氨基-2-羟基丁酰胺基乙酸:##STR8## 其中R.sub.1和R.sub.4具有与上述相同的含义。本发明还提供了由通式(III)表示的上述目标化合物的新中间体化合物和制备中间体化合物的方法。