Novel racemization process
    6.
    发明授权
    Novel racemization process 失效
    新的外消旋化过程

    公开(公告)号:US4151195A

    公开(公告)日:1979-04-24

    申请号:US789843

    申请日:1977-04-22

    CPC分类号: C07B55/00 C07C255/53

    摘要: A process for the preparation of an ester of chiral (A) acid with a racemic (R,S) .alpha.-cyano-3-phenoxybenzyl alcohol (B) by reacting an ester of chiral (A) acid with .alpha.-cyano-3-phenoxybenzyl alcohol of the formula ##STR1## in its optically active (R) form or (S) form or a mixture of esters of said (R) alcohol and (S) alcohol in non-equimolecular proportions with a base selected from the group consisting of ammonia, primary, secondary and tertiary amines, quaternary ammonium compounds, liquid amines of high molecular weight and a catalytic amount of a strong base in at least one solvent for the starting esters and in which the ester of racemic alcohol is soluble and recovering from the resulting solution the ester of chiral (A) acid with racemic (R,S) alcohol.

    摘要翻译: 通过使手性(A)酸的酯与α-氰基-3-氰基-3-苯氧基苄醇(B)的制备手性(A)酸的酯与外消旋(R,S) 式(I)所示的式(ⅩⅧ)的苯氧基苄醇或其光学活性(R)形式的(S)形式或所述(R)醇和(S)醇的酯与非等分子比例的酯与选自下组的碱 由氨,伯,仲和叔胺组成,季铵化合物,高分子量的液态胺和催化量的至少一种用于起始酯的溶剂中的强碱,其中外消旋醇的酯可溶于和回收 从所得溶液中将手性(A)酸与外消旋(R,S)醇的酯反应。