申请人:Yokozawa Tohru
公开号:US20070142472A1
公开(公告)日:2007-06-21
The present invention relates to a process for producing an optically active 3-(4-hydroxyphenyl)propionic acid useful as intermediates for medicines, through short steps in good yield and with high optical purity. More specifically, the present invention relates to a process for producing an optically active 3-(4-hydroxyphenyl)propionic acid of the formula (6): wherein R
2
is an alkyl group; R
5
to R
8
are each independently a hydrogen atom or a substituent; and the symbol * is an chiral carbon atom, or a salt thereof, which comprises reacting a benzaldehyde of the formula (1): wherein R
1
is a protective group; and R
5
to R
8
are each the same as defined above, with a glycolic acid derivative of the formula (2): wherein R
3
is a hydrocarbon group; and R
2
is the same as defined above, hydrolyzing the resulting product to give a cinnamic acid of the formula (4): wherein R
1
, R
2
and R
5
to R
8
are each the same as defined above, or a salt thereof, and subjecting the resulting cinnamic acid (4) or a salt thereof to asymmetric hydrogenation to give an optically active phenylpropionic acid of the formula (5): wherein all the symbols are each the same as defined above, or a salt thereof, followed by deprotection.
本发明涉及一种生产光学活性的3-(4-羟基苯基)丙酸的方法,该方法通过短步骤以良好产率和高光学纯度的方式,作为药物中间体。更具体地说,本发明涉及一种生产式(6)的光学活性3-(4-羟基苯基)丙酸的方法:其中R2是烷基;R5到R8分别独立地是氢原子或取代基;符号*是手性碳原子,或其盐,包括用式(1)的苯甲醛反应:其中R1是保护基;R5到R8分别与上述定义相同,与式(2)的乙二醇酸衍生物反应:其中R3是碳氢基团;R2与上述定义相同,水解所得产物得到式(4)的肉桂酸:其中R1、R2和R5到R8分别与上述定义相同,或其盐,并将所得的肉桂酸(4)或其盐经过不对称氢化作用得到式(5)的光学活性苯丙酸:其中所有符号均与上述定义相同,或其盐,然后去保护基。