Process for the optical resolution of racemic mixtures of alpha-naphtyl-propionic acids
申请人:ALFA WASSERMANN S.p.A.
公开号:EP0182279A1
公开(公告)日:1986-05-28
A new process for the optical resolution of racemic mixtures of a-naphthyl-propionic acids of formula
where R, is an alkyl group, straight or branched, having from 1 to 6 carbon atoms and R2 represents an hydrogen or an halogen atom.
This process comprises reacting a racemic mixture of a compound of formula II
wherein R1 and R2 have the above seen meanings and R3 is a reactive group, with an optically active compound of formula
wherein R4 is the residue of a primary or secondary alcohol which, taken with the NH2 radical, forms an optically active β-aminoalcohol, to give a pair of diastereoisomeric amides of formula
[d,d + 1,d] or [d,1 + 1,1] wherein R1, R2 and R4 have the above seen meanings, which is resolved into the single diastereoisomeric amides of formula
d,d or 1,d or d,1 or 1,1
The compounds of formula V, by means of a subsequent acid hydrolysis give the optically active a-naphthyl-propionic acids of formula
d or 1
wherein R1 and R2 have the above seen meanings.
一种光学解析式 a-萘基丙酸外消旋混合物的新工艺
其中,R 是具有 1 至 6 个碳原子的直链或支链烷基,R2 代表氢原子或卤素原子。
该工艺包括使式 II 的化合物的外消旋混合物反应
其中 R1 和 R2 具有上述含义,R3 为活性基团,与式 II 的光学活性化合物的外消旋混合物反应。
其中 R4 是伯醇或仲醇的残基,它与 NH2 基形成光学活性的 β-氨基醇,从而得到一对非对映异构的式酰胺。
[d,d+1,d]或[d,1+1,1],其中 R1、R2 和 R4 具有上述含义。
d,d 或 1,d 或 d,1 或 1,1
通过随后的酸水解,式 V 的化合物可得到具有光学活性的式 a-萘基丙酸
d或1
其中 R1 和 R2 具有上述含义。