Method of producing optically active 1,3-imidazolidine-4-ones
    1.
    发明授权
    Method of producing optically active 1,3-imidazolidine-4-ones 失效
    光学活性1,3-咪唑烷-4-酮的制备方法

    公开(公告)号:US5386035A

    公开(公告)日:1995-01-31

    申请号:US974422

    申请日:1992-11-12

    CPC分类号: C07D233/32 C07D233/38

    摘要: 2.2. 1,3-imidazolidine-4-ones having the General Formula: ##STR1## are obtained in a pure form especially by means of precipitation, in which production an optically active acid can be used at 0.5-0.8 eq. for the separation of racemates. The non-desired enantiomer can be racemized in an inert solvent and the cyclization to imidazolidinone can take place by means of the optically active acid, whereupon the separation of racemates takes place directly thereafter. 1,3-imidazolidine-4-ones are valuable educts for the preparation of branched or unbranched, proteinogenic or non-proteinogenic .alpha.-amino acids by means of diastereoselective alkylation and subsequent ring splitting.

    摘要翻译: 2.2。 以纯度的形式,特别是通过沉淀获得具有以下通式的1,3-咪唑烷-4-酮:其中0.5-0.8当量可以使用光学活性的酸。 用于分离外消旋体。 非期望的对映异构体可以在惰性溶剂中进行外消旋化,并且通过光学活性的酸可以进行环化成咪唑啉酮,随后直接进行外消旋体的分离。 1,3-咪唑烷-4-酮是通过非对映选择性烷基化和随后的环分裂制备支链或非支链,蛋白质或非蛋白质的α-氨基酸的有价值的衍生物。

    Method of producing optically active tert-leucinol and its use
    3.
    发明授权
    Method of producing optically active tert-leucinol and its use 失效
    光学活性叔 - 亮氨酸的制备方法及其用途

    公开(公告)号:US5723667A

    公开(公告)日:1998-03-03

    申请号:US603553

    申请日:1996-02-21

    CPC分类号: C07C213/10

    摘要: A method of producing optically active tert-leucinol (formula I) of high enantiomeric purity ##STR1## by converting racemic (RS)-tert-leucinol into a diastereomeric salt pair by reaction with an optically active acid, removing the salt pair from solution by fractionated crystallization and separating therefrom the optically active acid to release the optically active tert-leucinol from the salt. The optically active acid used is an N-acylated tert-leucine of general formula VIII: ##STR2## in which R can be hydrogen or an alkyl-, arylalkyl- or aryl group with up to 20 C atoms and * signifies a chirality center.

    摘要翻译: 通过与光学活性酸反应将外消旋(RS) - 特异亮氨酸转化为非对映异构体盐对,从而除去盐对,制备高对映体纯度(I)的光学活性叔 - 亮氨醇(式I) 通过分级结晶从溶液中分离出光学活性酸以从盐中释放光学活性的叔丁基醇。 使用的光学活性酸是通式VIII的N-酰化的叔 - 亮氨酸:其中R可以是氢或具有至多20个C原子的烷基 - ,芳基烷基 - 或芳基,*表示一个 手性中心。