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    • 1. 发明授权
    • Preparation of amino acids from unsaturated hydantoins
    • 从不饱和乙内酰脲制备氨基酸
    • US4613691A
    • 1986-09-23
    • US751581
    • 1985-07-08
    • Stanley B. MirvissMark W. Empie
    • Stanley B. MirvissMark W. Empie
    • C12P13/04C12P13/22C12P41/00C07C99/08
    • C12P13/222C12P13/04C12P41/00
    • Amino acids can be easily prepared by reducing unsaturated hydantoins to the corresponding saturated hydantoins by hydrogenating the unsaturated hydantoin using either Raney Nickel catalyst in the presence of more than a stoichiometric amount of caustic or by using zinc and hydrochloric acid followed by hydrolyzing the resultant composition with at least 3 molar equivalents of an alkali metal hydroxide to produce a racemate of an alpha amino acid. The amino acid in suitable derivative form can then be resolved particularly using a two-phase solvent system. The residual isomer of the amino acid remaining after the resolution process can then be racemized using either pyridoxal-5-phosphate or an aliphatic acid in combination with an aldehyde or a ketone. By these procedures, it is possible to obtain high yields of amino acids.
    • 氨基酸可以容易地通过将不饱和乙内酰脲还原成相应的饱和乙内酰脲,通过使用阮内镍催化剂在不超过化学计量的苛性碱存在下氢化不饱和乙内酰脲,或者通过使用锌和盐酸,然后水解所得组合物, 至少3摩尔当量的碱金属氢氧化物以产生α氨基酸的外消旋体。 然后可以使用两相溶剂系统特别地分解合适的衍生物形式的氨基酸。 然后可以使用吡哆醛-5-磷酸或与醛或酮的组合的脂族酸,将拆分过程后残留的氨基酸的残余异构体外消旋化。 通过这些方法,可以获得高产率的氨基酸。
    • 5. 发明授权
    • Racemization catalyst for amino acids
    • 用于氨基酸的外消旋化催化剂
    • US4766250A
    • 1988-08-23
    • US53906
    • 1987-07-10
    • Stanley B. Mirviss
    • Stanley B. Mirviss
    • C07B57/00C07C45/64C07C47/575C08L27/00
    • C07B57/00
    • There is disclosed a process for the racemization of amino acids and derivatives thereof. The racemization process of the present invention uses an aromatic aldehyde-containing polymer made from the reaction of a hydroxyaromatic aldehyde with a chloromethylated vinylbenzene polymer under reaction conditions to form an aromatic aldehyde-containing polymer wherein the aldehydic moiety is linked to the polymer through an ether linkage. There is also disclosed a process for the production of the racemization catalyst. Another embodiment of the invention comprises a process for the promotion of the racemization reaction wherein a tertiary amine-containing resin is used as a promoting agent.
    • 公开了氨基酸及其衍生物的外消旋化的方法。 本发明的外消旋化方法使用在反应条件下由羟基芳族醛与氯甲基化的乙烯基苯聚合物反应制备的含芳族醛的聚合物,形成含芳族醛的聚合物,其中醛部分通过醚连接到聚合物上 连锁。 还公开了外消旋化催化剂的制造方法。 本发明的另一个实施方案包括促进外消旋反应的方法,其中使用含叔胺的树脂作为促进剂。