Process for the preparation of optically active methionine amide
    1.
    发明授权
    Process for the preparation of optically active methionine amide 失效
    制备光学活性甲硫氨酸酰胺的方法

    公开(公告)号:US5468901A

    公开(公告)日:1995-11-21

    申请号:US88553

    申请日:1993-07-09

    CPC分类号: C07C319/28

    摘要: The invention relates to a process for preparing optically active methionine amide in high ee purities in which a mixture of D- and L-methionine amide or the Schiff bases thereof is at least partly converted, optionally in the presence of 0.5-4 equivalents of an aldehyde, relative to the amount of methionine amide, and water, in the presence of an organic solvent, using less than 1.2 equivalents of L- or D-mandelic acid, respectively, relative to the amount of D- or L-methionine amide, respectively, or the Schiff bases thereof, present in the mixture of D- and L-methionine amide or the Schiff bases thereof, into a salt of methionine amide and mandelic acid, a portion consisting substantially of one of the diastereoisomers of the salt is separated from the reaction mixture obtained, and the salt is converted into the optically active methionine. A high degree of optical purity is obtained. This process can be advantageously combined with a preparation of D,L-methionine amide from D,L-methionine nitrile by returning the residual methionine amide obtained after separation of the diastereomeric salt and recovery of the mandelic acid to the preparation of D,L-methionine amide where racemization of the recycled methionine amide takes place in situ. A high overall efficiency can thus obtained in spite of a relatively low efficiency of conversion into the diastereoisomeric salt, relative to the amount of D- and L-methionine amide, or the Schiff bases thereof, used.

    摘要翻译: 本发明涉及在高纯度中制备光学活性甲硫氨酰胺的方法,其中D-和L-甲硫氨酸酰胺或其席夫碱的混合物至少部分转化,任选地在0.5-4当量的 相对于甲硫氨酸酰胺的量和水,在有机溶剂的存在下,分别使用相对于D-或L-甲硫氨酸酰胺的量小于1.2当量的L-或D-扁桃酸, 或者其存在于D-和L-甲硫氨酸酰胺或其席夫碱的混合物中的席夫碱分成蛋氨酸酰胺和扁桃酸的盐,基本上由盐的非对映异构体组成的部分被分离 从得到的反应混合物中,将盐转化成光学活性的甲硫氨酸。 获得高度的光学纯度。 该方法可以有利地与D,L-甲硫氨酸腈制备D,L-甲硫氨酸酰胺,通过返回分离非对映异构盐后得到的残留的甲硫氨酰胺,并将扁桃酸回收制备D,L- 甲硫氨酰胺,其中回收的甲硫氨酸酰胺的外消旋化在原位发生。 因此,相对于使用的D-和L-甲硫氨酸酰胺或其席夫碱的量,尽管转化为非对映异构体盐的效率相对较低,因此可以获得高的整体效率。

    Process for preparing optically active 2-amino-w-oxoalkanoic acid
    2.
    发明授权
    Process for preparing optically active 2-amino-w-oxoalkanoic acid 失效
    光学活性2-氨基-W-氧代链烷酸的制备方法

    公开(公告)号:US06720169B1

    公开(公告)日:2004-04-13

    申请号:US09640796

    申请日:2000-08-18

    IPC分类号: C12P1300

    摘要: A process is disclosed for preparing an (S)-2-amino-&ohgr;-oxoalkanoic acid derivative in which the corresponding aldehyde is converted into the corresponding acetal-protected aldehyde, the acetal-protected aldehyde is converted into the corresponding aminonitrile, the aminonitrile is converted into the corresponding amino acid amide, the amino acid amide is subjected to an enzymatic, enantioselective hydrolysis in which the (R)-enantiomer of the amino acid amide remains and the (S)-enantiomer is converted into the (S)-amino acid, and the (S)-amino acid is isolated. Preferably, the reaction mixture obtained after the conversion of the aminonitrile into the amino acid amide is treated with a benzaldehyde to form the Schiff base of the amino acid amide. The Schiff base is separated out and is converted into the free amino acid amide.

    摘要翻译: 公开了一种制备(S)-2-氨基-ω-氧代链烷酸衍生物的方法,其中相应的醛转化成相应的缩醛保护的醛,缩醛保护的醛转化成相应的氨基腈,氨基腈是 转化为相应的氨基酸酰胺,氨基酸酰胺进行酶,对映选择性水解,其中氨基酸酰胺的(R) - 对映异构体残留,(S) - 对映异构体转化为(S) - 氨基 酸,并分离出(S) - 氨基酸。 优选将氨基腈转化成氨基酸酰胺后得到的反应混合物用苯甲醛处理,形成氨基酸酰胺的席夫碱。 将席夫碱分离出并转化成游离氨基酸酰胺。

    Process for the separation of a mixture of enantiomers
    3.
    发明授权
    Process for the separation of a mixture of enantiomers 失效
    分离对映异构体混合物的方法

    公开(公告)号:US06235927B1

    公开(公告)日:2001-05-22

    申请号:US08955612

    申请日:1997-10-22

    IPC分类号: C07B5500

    摘要: A diastereomer complex obtained via a process for the separation of enantiomers is disclosed, wherein separation can be rapidly effected such that enantiomers are obtained with high e.e. values. The process pets the separation of mixtures of enantiomers in which more than one resolving agent is used, of which at least one resolving agent is optically active, and which yields a diastereomer complex containing at least two resolving agents in optically active form. The process provides for, inter alia, a diastereomer complex having at least three compounds of which at least two compounds are resolving agents in optically active form, and at least one compound is an onantiomer in optically active form. Also provided is a diastereomer complex having at least three compounds of which at lea one compound is a resolving agent in optically active form, and at least two compounds which are enantiomers in optically active form.

    摘要翻译: 公开了通过分离对映异构体的方法获得的非对映异构体复合物,其中可快速进行分离,使得以高e.e。获得对映异构体。 价值观。 该方法可以分离其中使用多于一种拆分剂的对映异构体混合物,其中至少一种拆分剂是光学活性的,并且其产生含有至少两种旋光活性形式的拆分剂的非对映异构体复合物。 该方法特别提供了具有至少三种化合物的非对映异构体复合物,其中至少两种化合物是旋光活性形式的拆分剂,并且至少一种化合物是光学活性形式的对映异构体。 还提供了具有至少三种化合物的非对映异构体复合物,其中一种化合物是旋光活性形式的拆分剂,以及至少两种为光学活性形式的对映异构体的化合物。

    Process for preparing optically active 2-amino-&ohgr;-oxoalkanoic acid derivatives
    4.
    发明授权
    Process for preparing optically active 2-amino-&ohgr;-oxoalkanoic acid derivatives 失效
    光学活性2-氨基-ω-氧代链烷酸衍生物的制备方法

    公开(公告)号:US06291701B1

    公开(公告)日:2001-09-18

    申请号:US09640916

    申请日:2000-08-18

    IPC分类号: C07C25511

    摘要: A process is disclosed for preparing an (S)-2-amino-&ohgr;-oxoalkanoic acid derivative in which the corresponding aldehyde is converted into the corresponding acetal-protected aldehyde, the acetal-protected aldehyde is converted into the corresponding aminonitrile, the aminonitrile is converted into the corresponding amino acid amide, the amino acid amide is subjected to an enzymatic, enantioselective hydrolysis in which the (R)-enantiomer of the amino acid amide remains and the (S)-enantiomer is converted into the (S)-amino acid, and the (S)-amino acid is isolated. Preferably,the reaction mixture obtained after the conversion of the aminonitrile into the amino acid amide is treated with a benzaldehyde to form the Schiff base of the amino acid amide. The Schiff base is separated out and is converted into the free amino acid amide.

    摘要翻译: 公开了一种制备(S)-2-氨基-ω-氧代链烷酸衍生物的方法,其中相应的醛转化成相应的缩醛保护的醛,缩醛保护的醛转化成相应的氨基腈,氨基腈是 转化为相应的氨基酸酰胺,氨基酸酰胺进行酶,对映选择性水解,其中氨基酸酰胺的(R) - 对映异构体残留,(S) - 对映异构体转化为(S) - 氨基 酸,并分离出(S) - 氨基酸。 优选将氨基腈转化成氨基酸酰胺后得到的反应混合物用苯甲醛处理,形成氨基酸酰胺的席夫碱。 将席夫碱分离出并转化成游离氨基酸酰胺。

    Process for preparing optically active 2-amino-&ohgr;-oxoalkanoic acid derivatives
    5.
    发明授权
    Process for preparing optically active 2-amino-&ohgr;-oxoalkanoic acid derivatives 失效
    光学活性2-氨基-ω-氧代链烷酸衍生物的制备方法

    公开(公告)号:US06222052B1

    公开(公告)日:2001-04-24

    申请号:US09641619

    申请日:2000-08-18

    IPC分类号: C07D31730

    摘要: A process is disclosed for preparing an (S)-2-amino-&ohgr;-oxoalkanoic acid derivative in which the corresponding aldehyde is converted into the corresponding acetal-protected aldehyde, the acetal-protected aldehyde is converted into the corresponding aminonitrile, the aminonitrile is converted into the corresponding amino acid amide, the amino acid amide is subjected to an enzymatic, enantioselective hydrolysis in which the (R)-enantiomer of the amino acid amide remains and the (S)-enantiomer is converted into the (S)-amino acid, and the (S)-amino acid is isolated. Preferably, the reaction mixture obtained after the conversion of the aminonitrile into the amino acid amide is treated with a benzaldehyde to form the Schiff base of the amino acid amide. The Schiff base is separated out and is converted into the free amino acid amide.

    摘要翻译: 公开了一种制备(S)-2-氨基-ω-氧代链烷酸衍生物的方法,其中相应的醛转化成相应的缩醛保护的醛,缩醛保护的醛转化成相应的氨基腈,氨基腈是 转化为相应的氨基酸酰胺,氨基酸酰胺进行酶,对映选择性水解,其中氨基酸酰胺的(R) - 对映异构体残留,(S) - 对映异构体转化为(S) - 氨基 酸,并分离出(S) - 氨基酸。 优选将氨基腈转化成氨基酸酰胺后得到的反应混合物用苯甲醛处理,形成氨基酸酰胺的席夫碱。 将席夫碱分离出并转化成游离氨基酸酰胺。

    Process for the separation of a mixture of enantiomers
    6.
    发明授权
    Process for the separation of a mixture of enantiomers 失效
    分离对映异构体混合物的方法

    公开(公告)号:US06465684B2

    公开(公告)日:2002-10-15

    申请号:US09784083

    申请日:2001-02-16

    IPC分类号: C07C33100

    摘要: A diastereomer complex obtained via a process for the separation of enantiomers is disclosed, wherein separation can be rapidly effected such that enantiomers are obtained with high e.e. values. The process permits the separation of mixtures of enantiomers in which more than one resolving agent is used, of which at least one resolving agent is optically active, and which yields a diastereomer complex containing at least two resolving agents in optically active form. The process provides for, inter alia, a diastereomer complex having at least three compounds of which at least two compounds are resolving agents in optically active form, and at least one compound is an enantiomer in optically active form. Also provided is a diastereomer complex having at least three compounds of which at least one compound is a resolving agent in optically active form, and at least two compounds which are enantiomers in optically active form.

    摘要翻译: 公开了通过分离对映异构体的方法获得的非对映异构体复合物,其中可快速进行分离,使得以高e.e。获得对映异构体。 价值观。 该方法允许分离其中使用多于一种拆分剂的对映异构体的混合物,其中至少一种拆分剂是光学活性的,并且其产生含有至少两种光学活性形式的拆分剂的非对映异构体复合物。 该方法特别提供了具有至少三种化合物的非对映异构体复合物,其中至少两种化合物是旋光活性形式的拆分剂,并且至少一种化合物是光学活性形式的对映异构体。 还提供了具有至少三种化合物的至少三种化合物的非对映异构体复合物,其中至少一种化合物是光学活性形式的拆分剂,以及至少两种是光学活性形式的对映异构体的化合物。