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    • 51. 发明申请
    • PREPARATION OF (+)-CATECHIN, (-)-EPICATECHIN, (-)-CATECHIN, (+)-EPICATECHIN, AND THEIR 5,7,3',4'-TETRA-O-BENZYL ANALOGUES
    • (+) - 卡培他滨( - ) - EPICATECHIN,( - ) - CATECHIN,(+) - EPICATECHIN及其5,7,3',4'-四氮杂 - 邻苯甲酸类似物的制备
    • WO2007002877A1
    • 2007-01-04
    • PCT/US2006/025482
    • 2006-06-28
    • MARS, INCORPORATEDROMANCZYK, Leo, J., Jr.SHARMA, Pradeep, K.GOU, DamingGOU, Yanni
    • ROMANCZYK, Leo, J., Jr.SHARMA, Pradeep, K.GOU, DamingGOU, Yanni
    • C07D311/22C07C45/00C07C49/00
    • C07C41/18C07C45/71C07C45/74C07D311/62C07C49/84C07C47/575C07C43/23
    • Processes for preparing racemic mixtures of 5,7,3',4'-tetra-O-benzyl-(±)-catechin and (±)-epicatechin involves (i) condensing 2-hydroxy-4,6-bis(benzyloxy)-acetophenone and 3,4-bis(benzyloxy)benzaldehyde, cyclizing the resulting compound, oxidizing the resulting compound; (ii) dihydroxylating (E)-3-(3',4'-bis(benzyloxy)phenyl)prop-2-ene-1 -ol and reducing the 1 ,2-diol; or (iii) coupling 3,5-bis(benzyloxy)phenol with (£)-3,5-bis(benzyloxy)-2-(3',4'-bis(benzyloxy)phenyl)allyl)phenol and cyclizing the resulting chalcone. A process for preparing the benzylated epimers of catechin and epicatechin involves seven steps. 3,4-Bis(benzyloxy)benzaldehyde is coupled with 2-hydroxy-4,6-benzyloxy-acetophenone to form a chalcone. The chalcone is selectively reduced to an alkene. The phenolic group of the alkene is protected. The protected alkene is asymetrically dihydroxylated. The resulting compound is deprotected, cyclized, and finally hydrolyzed. Epimers resulting from these processes are chemically resolved or separated by chiral high pressure liquid chromatography. Also disclosed is a method for preparing enantiomerically pure 5,7,3',4'-tetra-O-benzyl-(+)-catechin from a racemic mixture using dibenzoyl-L-tartaric acid monomethyl ester. Further, disclosed is an improved process for preparing dibenzoyl-L-tartaric acid monomethyl ester.
    • 制备5,7,3',4'-四-O-苄基 - (±) - 儿茶素和(±) - 表儿茶素的外消旋混合物的方法包括(i)2-羟基-4,6-双(苄氧基) - 苯乙酮和3,4-双(苄氧基)苯甲醛,使所得化合物环化,氧化所得化合物; (ii)将(E)-3-(3',4'-双(苄氧基)苯基)丙-2-烯-1-醇二羟基化并还原1,2-二醇; 或(iii)将3,5-二(苄氧基)苯酚与(£)-3,5-双(苄氧基)-2-(3',4'-双(苄氧基)苯基)烯丙基)苯酚偶合并使所得 查尔酮。 制备儿茶素和表儿茶素的苄基化差向异构体的方法涉及七个步骤。 3,4-二(苄氧基)苯甲醛与2-羟基-4,6-苄氧基 - 苯乙酮偶联,形成查耳酮。 查耳酮选择性还原成烯烃。 烯烃的酚基被保护。 受保护的烯是非对称二羟基化的。 将所得化合物脱保护,环化,最后水解。 通过手性高压液相色谱法化学拆分或分离由这些方法得到的异构体。 还公开了使用二苯甲酰基-L-酒石酸单甲酯从外消旋混合物制备对映体纯的5,7,3',4'-四-O-苄基 - (+) - 儿茶素的方法。 此外,公开了一种制备二苯甲酰基-L-酒石酸单甲酯的改进方法。