申请人:Verzijl Karl Maria Gerardus
公开号:US20060142610A1
公开(公告)日:2006-06-29
Process for the racemisation of an enantiomerically enriched α-amino nitrile characterized in that the enantiomerically enriched α-amino nitrile is contacted with a lewis acid catalyst. Preferably an aprotic solvent is used. The lewis acid catalyst preferably comprises a metal chosen from main group elements IA-IVA of the Periodic Table (CAS version), the transition metals and the lanthanides, in particular Al, Ti, Zr, or lanthanides. The catalsyt for example has the general structure MnXpSqLr, and preferably is chosen from the group of aluminum alkoxides, aluminum alkyls, lanthanide alkoxydes and lanthanocenes. The racemisation may be performed in combination with a resolution process, for instance in combination with an enzymatic or a crystallization induced resolution process, preferably in situ, for instance in situ in a crystallization induced asymmetric transformation process.
对映体富集的 α-氨基腈的消旋化工艺,其特征在于对映体富集的 α-氨基腈与路易斯酸催化剂接触。最好使用无相溶剂。路易斯酸催化剂最好由选自元素周期表(CAS 版)主族元素 IA-IVA、过渡金属和镧系元素,特别是 Al、Ti、Zr 或镧系元素的金属组成。例如,催化剂的一般结构为 MnXpSqLr,最好选自铝烷氧基化物、铝烷基、镧烷氧基化物和镧烯类。外消旋化可以结合解析过程进行,例如结合酶解或结晶诱导解析过程,最好是原位解析, 例如在结晶诱导不对称转化过程中原位解析。