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    • 5. 发明公开
    • 락톤의 입체 선택적 합성방법
    • 一种用于立体选择性合成的方法
    • KR1020060006043A
    • 2006-01-18
    • KR1020057019945
    • 2004-04-20
    • 디에스엠 아이피 어셋츠 비.브이.
    • 웨흘리크리스토프
    • C07D491/04
    • C07D491/04
    • A process is described for the stereoselective synthesis of a chiral lactone which can be used as an intermediate in the synthesis of biotin. The process includes a reaction sequence in which a cyclic meso- carboxylic acid anhydride is converted with the aid of a chiral alcohol with ring opening into a dicarboxylic acid monoester. With respect to the dicarboxylic acid monoester obtained from the cyclic meso-carboxylic acid anhydride and the chiral alcohol, the reaction proceeds diastereoselectively. The reaction is performed in the presence of a specific catalyst improving the diastereomeric purity of the dicarboxylic acid monoester.
    • 描述了可用作生物素合成中的中间体的手性内酯的立体选择性合成的方法。 该方法包括一个反应顺序,其中环状中间体羧酸酐借助手性醇转化成开环的二羧酸单酯。 对于由环状内消旋羧酸酐和手性醇获得的二羧酸单酯,反应非对映异构。 反应在特定催化剂存在下进行,改善二羧酸单酯的非对映体纯度。