申请人:Central Glass Company, Limited
公开号:US20040024253A1
公开(公告)日:2004-02-05
Optically active (R)-1-(4-trifluoromethylphenyl)ethylamine is a novel compound as an important intermediate for medicines and agricultural chemicals. This compound can be obtained with high optical purity and high yield by a process including the steps of (a) a dehydrocondensation of 4′-(trifluoromethyl)acetophenone and an optically active (R)-1-phenylethylamine to obtain an optically active imine; (b) asymmetrically reducing the imine into an optically active secondary amine; (c) reacting the amine with an organic acid (phthalic acid or benzenesulfonic acid), thereby obtaining a product that is a phthalate of or benzenesulfonate of the amine; (d) subjecting the product of the step (c) to a hydrogenolysis, thereby obtaining a product that is a phthalate of or benzenesuilfonate of optically active (R)-1-(4-trifluoromethylphenyl)ethylamine; and (e) neutralizing the product of the step (d) into the optically active (R)-1-(4-trifluoromethylphenyl)ethylamine.
光学活性的(R)-1-(4-三氟甲基苯基)乙胺是一种重要的药物和农业化学品中间体。该化合物可以通过以下步骤获得高光学纯度和高产率:(a)将4'-(三氟甲基)乙酮和光学活性(R)-1-苯乙胺脱水缩合得到光学活性亚胺;(b)将亚胺不对称还原为光学活性二级胺;(c)将胺与有机酸(邻苯二甲酸或苯磺酸)反应,从而获得胺的邻苯二甲酸盐或苯磺酸盐产物;(d)将步骤(c)的产物经过氢解,从而获得光学活性(R)-1-(4-三氟甲基苯基)乙胺的邻苯二甲酸盐或苯磺酸盐产物;(e)将步骤(d)的产物中和成光学活性(R)-1-(4-三氟甲基苯基)乙胺。