Synthesis of oligomeric epicatechin and catechin-derived procyanidins
    1.
    发明申请
    Synthesis of oligomeric epicatechin and catechin-derived procyanidins 失效
    低聚表儿茶素和儿茶素衍生原花青素的合成

    公开(公告)号:US20050020512A1

    公开(公告)日:2005-01-27

    申请号:US10481729

    申请日:2003-10-02

    摘要: Various processes are disclosed for preparing procyanidin oligomers having (4,8)-interflavan linkages. In an improved process, a tetra-O-protected-epicatechin or catechin monomer or oligomer is coupled with a protected, C-4 alkoxy-activated-epicatechin or -catechin monomer in the presence of an acidic clay instead of a Lewis acid. In a second process, a 5,7,3′,4′-tetra-O-protected or preferably penta-O-protected-epicatechin or -catechin monomer or oligomer is reacted with a tetra-O-protected or preferably penta-O-protected-epicatechin or -catechin monomer having a thio activating group at the C-4 position; the coupling is carried out in the presence of silver tetrafluoroborate. In third process, two molecules of a penta-O-protected-epicatechin or -catechin monomer activated with a 2-(benzothiazolyl)thio group at the C-4 position are self-condensed in the presence of silver tetrafluoroborate. An improved two-step process for preparing a C-4 alkoxy activated tetra-O-benzyl-protected, 8-bromo-blocked-epicatechin or -catechin monomer is also provided. The use of naturally-derived and synthetically-prepared procyanidin (4β,8)4-pentamers to treat cancer is also disclosed.

    摘要翻译: 公开了用于制备具有(4,8) - 连续黄烷键的原花青素低聚物的各种方法。 在改进的方法中,在酸性粘土代替路易斯酸的情况下,将四-O-保护的表儿茶素或儿茶素单体或低聚物与被保护的C-4烷氧基 - 表儿茶素或儿茶素单体相结合。 在第二种方法中,5,7,3',4'-四-O-保护的或优选五-O-保护的表儿茶素或儿茶素单体或低聚物与四-O-保护的或优选五-O 在C-4位具有硫代活化基团的保护表儿茶素或儿茶素单体; 在四氟硼酸银的存在下进行偶合。 在第三种方法中,在四氟硼酸银存在下,用2-(苯并噻唑基)硫基在C-4位上活化的五分子保护的表儿茶素或儿茶素单体的两分子是自缩合的。 还提供了一种用于制备C-4烷氧基活化的四-O-苄基保护的8-溴封闭的表儿茶素或儿茶素单体的改进的两步法。 还公开了使用天然衍生的和合成制备的原花青素(4beta,8)4-五聚体来治疗癌症。

    Synthesis of Oligomeric Epicatechin- and Catechin-Derived Procyanidins
    2.
    发明申请
    Synthesis of Oligomeric Epicatechin- and Catechin-Derived Procyanidins 审中-公开
    低分子表儿茶素和儿茶素衍生的原花青素的合成

    公开(公告)号:US20070276147A1

    公开(公告)日:2007-11-29

    申请号:US11757011

    申请日:2007-06-01

    IPC分类号: C07D311/04

    摘要: Various processes are disclosed for preparing procyanidin oligomers having (4,8)-interflavan linkages. In an improved process, a tetra-O-protected-epicatechin or -catechin monomer or oligomer is coupled with a protected, C-4 alkoxy-activated-epicatechin or -catechin monomer in the presence of an acidic clay instead of a Lewis acid. In a second process, a 5,7,3′,4′-tetra-O-protected or preferably penta-O-protected-epicatechin or -catechin monomer or oligomer is reacted with a tetra-O-protected or preferably penta-O-protected-epicatechin or -catechin monomer having a thio activating group at the C-4 position; the coupling is carried out in the presence of silver tetrafluoroborate. In third process, two molecules of a penta-O-protected-epicatechin or -catechin monomer activated with a 2-(benzothiazolyl)thio group at the C-4 position are self-condensed in the presence of silver tetrafluoroborate. An improved two-step process for preparing a C-4 alkoxy activated tetra-O-benzyl-protected, 8-bromo-blocked-epicatechin or -catechin monomer is also provided. The use of naturally-derived and synthetically-prepared procyanidin (4β,8)4-pentamers to treat cancer is also disclosed.

    摘要翻译: 公开了用于制备具有(4,8) - 连续黄烷键的原花青素低聚物的各种方法。 在改进的方法中,在酸性粘土代替路易斯酸的情况下,将四-O-保护的表儿茶素或儿茶素单体或低聚物与受保护的C-4烷氧基 - 表儿茶素或儿茶素单体偶合。 在第二种方法中,5,7,3',4'-四-O-保护的或优选五-O-保护的表儿茶素或儿茶素单体或低聚物与四-O-保护的或优选五-O 在C-4位具有硫代活化基团的保护表儿茶素或儿茶素单体; 在四氟硼酸银的存在下进行偶联。 在第三种方法中,在四氟硼酸银存在下,用2-(苯并噻唑基)硫基在C-4位上活化的五分子保护的表儿茶素或儿茶素单体的两分子是自缩合的。 还提供了一种用于制备C-4烷氧基活化的四-O-苄基保护的8-溴封闭的表儿茶素或儿茶素单体的改进的两步法。 还公开了使用天然衍生的和合成制备的原花青素(4beta,8)4质子以治疗癌症。

    Synthesis of oligomeric epicatechin and catechin-derived procyanidins
    3.
    发明授权
    Synthesis of oligomeric epicatechin and catechin-derived procyanidins 失效
    低聚表儿茶素和儿茶素衍生原花青素的合成

    公开(公告)号:US07244855B2

    公开(公告)日:2007-07-17

    申请号:US10481729

    申请日:2003-10-02

    IPC分类号: C07D311/00

    摘要: Various processes are disclosed for preparing procyanidin oligomers having (4,8)-interflavan linkages. In an improved process, a tetra-O-protected-epicatechin or -catechin monomer or oligomer is coupled with a protected, C-4 alkoxy-activated-epicatechin or -catechin monomer in the presence of an acidic clay instead of a Lewis acid. In a second process, a 5,7,3′,4′-tetra-O-protected or preferably penta-O-protected-epicatechin or -catechin monomer or oligomer is reacted with a tetra-O-protected or preferably penta-O-protected-epicatechin or -catechin monomer having a thio activating group at the C-4 position; the coupling is carried out in the presence of silver tetrafluoroborate. In third process, two molecules of a penta-O-protected-epicatechin or -catechin monomer activated with a 2-(benzothiazolyl)thio group at the C-4 position are self-condensed in the presence of silver tetrafluoroborate. An improved two-step process for preparing a C-4 alkoxy activated tetra-O-benzyl-protected, 8-bromo-blocked-epicatechin or -catechin monomer is also provided. The use of naturally-derived and synthetically-prepared procyanidin (4β,8)4-pentamers to treat cancer is also disclosed.

    摘要翻译: 公开了用于制备具有(4,8) - 连续黄烷键的原花青素低聚物的各种方法。 在改进的方法中,在酸性粘土代替路易斯酸的情况下,将四-O-保护的表儿茶素或儿茶素单体或低聚物与受保护的C-4烷氧基 - 表儿茶素或儿茶素单体偶合。 在第二种方法中,5,7,3',4'-四-O-保护的或优选五-O-保护的表儿茶素或儿茶素单体或低聚物与四-O-保护的或优选五-O 在C-4位具有硫代活化基团的保护表儿茶素或儿茶素单体; 在四氟硼酸银的存在下进行偶合。 在第三种方法中,在四氟硼酸银存在下,用2-(苯并噻唑基)硫基在C-4位上活化的五分子保护的表儿茶素或儿茶素单体的两分子是自缩合的。 还提供了一种用于制备C-4烷氧基活化的四-O-苄基保护的8-溴封闭的表儿茶素或儿茶素单体的改进的两步法。 还公开了使用天然衍生的和合成制备的原花青素(4beta,8)4质子以治疗癌症。