Chiral boron catalysts for reduction of ketones and process for their
preparation
    7.
    发明授权
    Chiral boron catalysts for reduction of ketones and process for their preparation 失效
    用于还原酮的手性硼催化剂及其制备方法

    公开(公告)号:US5189177A

    公开(公告)日:1993-02-23

    申请号:US730316

    申请日:1991-07-15

    摘要: The chiral catalyst of general structure 1, or its enantiomer ##STR1## is prepared by treating the corresponding N-carboxy anhydride of structure 2 ##STR2## with an aryl metal, especially a phenyl metal such as an aryl magnesium halide, aryl lithium, aryl zinc or aryl cesium, to form a 1,1-diaryl- methanol of structure 3 ##STR3## followed by treatment with a compound of structure, 4 ##STR4## The catalyst, wherein R is aromatic, is novel and in some cases superior to the catalyst wherein R is alkyl or aralkyl in directing the chirality of diborane, borane-dimethyl sulfide or borane-tetrahydrofuran reductions of ketones to secondary alcohols.

    摘要翻译: 一般结构1或其对映异构体1的手性催化剂通过用芳基金属,特别是苯基金属如芳基卤化镁,芳基锂处理结构2的相应N-羧酸酐来制备 ,芳基锌或芳基铯,以形成结构3的1,1-二芳基 - 甲醇3,然后用结构化合物4处理。其中R是芳族的催化剂是新颖的,并且在 一些情况优于催化剂,其中R是烷基或芳烷基,用于指导乙硼烷,硼烷 - 二甲基硫醚或甲硼烷 - 四氢呋喃减少酮对仲醇的手性。

    Chiral catalysts for reduction of ketones and process for their
preparation
    8.
    发明授权
    Chiral catalysts for reduction of ketones and process for their preparation 失效
    用于还原酮的手性催化剂及其制备方法

    公开(公告)号:US5264585A

    公开(公告)日:1993-11-23

    申请号:US966658

    申请日:1992-10-26

    摘要: The chiral catalyst of general structure 1, or its enantiomer ##STR1## is prepared by treating the corresponding N-carboxy anhydride of structure 2 ##STR2## with an aryl metal, especially a phenyl metal such as an aryl magnesium halide, aryl lithium, aryl zinc or aryl cesium, to form a 1,1-diaryl- methanol of structure 3 ##STR3## followed by treatment with a compound of structure, 4 ##STR4## The catalyst, wherein R is aromatic, is novel and in some cases superior to the catalyst wherein R is alkyl or aralkyl in directing the chirality of diborane, borane-dimethyl sulfide or borane-tetrahydrofuran reductions of ketones to secondary alcohols.

    摘要翻译: 一般结构1或其对映异构体1的手性催化剂通过用芳基金属,特别是苯基金属如芳基卤化镁,芳基锂处理结构2的相应N-羧酸酐来制备 ,芳基锌或芳基铯,以形成结构3的1,1-二芳基 - 甲醇3,然后用结构化合物4处理。其中R是芳族的催化剂是新颖的,并且在 一些情况优于催化剂,其中R是烷基或芳烷基,用于指导乙硼烷,硼烷 - 二甲基硫醚或甲硼烷 - 四氢呋喃减少酮对仲醇的手性。