Cinchona-alkaloid-based catalysts, and asymmetric alcoholysis of cyclic anhydrides using them
申请人:Deng Li
公开号:US20050043353A1
公开(公告)日:2005-02-24
One aspect of the present invention relates to cinchona-alkaloid-based catalysts. A second aspect of the invention relates to a method of preparing a derivatized cinchona alkaloid catalyst by reacting a cinchona-alkaloid with base and a compound that has a suitable leaving group. Another aspect of the present invention relates to a method of preparing a chiral, non-racemic compound from a prochiral cyclic anhydride or a meso cyclic anhydride, comprising the step of: reacting a prochiral cyclic anhydride or a meso cyclic anhydride with a nucleophile in the presence of a catalyst; wherein said prochiral cyclic anhydride or meso cyclic anhydride comprises an internal plane of symmetry or point of symmetry or both; thereby producing a chiral, non-racemic compound; wherein said catalyst is a derivatized cinchona-alkaloid. Yet another aspect of the present invention relates to a method of kinetic resolution, comprising the step of: reacting a racemic cyclic anhydride with an alcohol in the presence of a derivatized cinchona-alkaloid catalyst.
本发明的一个方面涉及基于金鸡纳碱的催化剂。本发明的第二个方面涉及通过将金鸡纳碱与碱和具有适当离去基团的化合物反应来制备衍生金鸡纳碱催化剂的方法。本发明的另一个方面涉及从一个前手循环酸酐或一个中间循环酸酐制备手性非拉克米化合物的方法,包括以下步骤:在催化剂的存在下,将前手循环酸酐或中间循环酸酐与亲核试剂反应;其中所述前手循环酸酐或中间循环酸酐包括一个内部对称平面或对称点或两者;从而产生手性非拉克米化合物;其中所述催化剂是衍生金鸡纳碱。本发明的另一个方面涉及一个动力学分辨的方法,包括以下步骤:在衍生金鸡纳碱催化剂的存在下,将拉克米循环酸酐与醇反应。