Chiral boron catalysts for reduction of ketones and process for their
preparation
    12.
    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

    CPC classification number: C07D207/08 C07D495/04 C07F5/025

    Abstract: 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.

    Abstract translation: 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。

    Lipopeptide derivatives
    20.
    发明授权
    Lipopeptide derivatives 失效
    脂肽衍生物

    公开(公告)号:US5369093A

    公开(公告)日:1994-11-29

    申请号:US670604

    申请日:1991-03-15

    CPC classification number: C07K7/56 A61K38/00

    Abstract: The present invention is directed to water-soluble derivatives of antibiotic lipopeptides having the formula. ##STR1## wherein R is H or OH and R' is a phosphono, sulfo or acyl radical possessing a charged group at neutral pH.The derivatives are esters but having a charged group, have good solubility properties in aqueous medium, rendering them more useful as therapeutic agents.

    Abstract translation: 本发明涉及具有下式的抗生素脂肽的水溶性衍生物。 SEQ ID NO: 1 + TR 其中R是H或OH,R'是在中性pH下具有带电基团的膦酰基,磺基或酰基。 衍生物是酯,但具有带电基团,在水性介质中具有良好的溶解性,使得它们更有用作治疗剂。

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