Resolution of the racemates of primary and secondary amines by
enzyme-catalyzed acylation
    7.
    发明授权
    Resolution of the racemates of primary and secondary amines by enzyme-catalyzed acylation 失效
    通过酶催化酰化拆分伯胺和仲胺的外消旋体

    公开(公告)号:US5728876A

    公开(公告)日:1998-03-17

    申请号:US596238

    申请日:1996-03-11

    CPC分类号: C12P13/02 C12P41/007

    摘要: A process for producing optically active primary and secondary amines from the corresponding racemates is characterised in that (a) a racemic amine is enantioselectively acylated in the presence of a hydrolase with an ester whose acid component bears a fluorine, nitrogen, oxygen or sulphur atom at the proximity of the carbonyl carbon atom; (b) the mixture of optically active amine and optically active acylated amine is separated so that an enantiomer of amine is produced; (c) if desired the other enantiomer of the amine is extracted from the acylated amine by amide cleavage.

    摘要翻译: PCT No.PCT / EP94 / 03102 Sec。 371日期:1996年3月11日 102(e)1996年3月11日PCT PCT 1994年9月16日PCT公布。 出版物WO95 / 08636 日期:1995年3月30日从相应的外消旋体制备光学活性伯胺和仲胺的方法的特征在于:(a)外消旋胺在水解酶存在下被对映选择性酰化,其中酸组分含有氟,氮, 在羰基碳原子附近的氧或硫原子; (b)分离光学活性胺和光学活性酰化胺的混合物,使得产生胺的对映异构体; (c)如果需要,胺的另一对映异构体通过酰胺裂解从酰化胺中提取。

    Process for preparing D,L-aspartic acid from ammonium salts of the
maleic acid
    9.
    发明授权
    Process for preparing D,L-aspartic acid from ammonium salts of the maleic acid 失效
    从马来酸的铵盐制备D,L-天冬氨酸的方法

    公开(公告)号:US5756839A

    公开(公告)日:1998-05-26

    申请号:US809141

    申请日:1997-03-24

    CPC分类号: C07C227/06 C07C229/24

    摘要: A process is disclosed for preparing D,L-aspartic acid by beating aqueous solutions of ammonium salts of the maleic acid. The molar ratio of maleic acid to ammonia ranges from 1:1 to 1:50. The process is carried out at temperatures from 60.degree. to 250.degree. C. and pressures of at least 1 bar. The pressure applied during the reaction is adjusted to ensure that the reaction mixture is almost completely present in liquid phase. Excess ammonia is removed and the reaction solution is acidified so as to release D,L-aspartic acid, which is then isolated.

    摘要翻译: PCT No.PCT / EP95 / 03600 Sec。 371日期1997年3月24日 102(e)1997年3月24日PCT PCT 1995年9月13日PCT公布。 出版物WO96 / 09277 日期:1996年3月28日公开了通过马来酸的铵盐的打浆水溶液制备D,L-天冬氨酸的方法。 马来酸与氨的摩尔比为1:1至1:50。 该方法在60℃至250℃的温度和至少1巴的压力下进行。 调节反应期间施加的压力以确保反应混合物几乎完全存在于液相中。 除去过量的氨,并将反应溶液酸化,以释放分离的D,L-天冬氨酸。