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    • 1. 发明授权
    • Synthesis of [2.2.1]bicyclo nucleosides
    • [2.2.1]双环核苷的合成
    • US06734291B2
    • 2004-05-11
    • US10233177
    • 2002-12-16
    • Alexei KochkineJef FensholdtHenrik M. Pfundheller
    • Alexei KochkineJef FensholdtHenrik M. Pfundheller
    • C07H1504
    • C07H19/06C07H19/16
    • A synthesis of [2.2.1]bicyclo nucleosides which is shorter and provides higher overall yields proceeds via the key intermediate of the general formula III, wherein R4 and R5 are, for instance, sulfonates and R7 is, for instance, a halogen or an acetate. From compounds of the general formula II, such as 3-O-aryl-4-C-hydroxymethyl-1,2-O-isopropylidene-&agr;-D-ribofuranose, intermediates of the general formula III are suitable for coupling with silylated nucleobases. Upon one-pot base-induced ring-closure and desulfonation of the formed [2.2.1]bicyclo nucleoside, a short route to each the LNA (Locked Nucleic Acid) derivatives of adenosine, cytosine, uridine, thymidine and guanidine is demonstrated. The use of the 5′-sulfonated ring-closed intermediate also allows for synthesis of 5′-amino- and thio-LNAs
    • 较短且提供更高总产率的[2.2.1]双环核苷的合成通过通式III的关键中间体进行,其中R 4和R 5为例如磺酸盐,且R 7为例如卤素或 乙酸盐。 从通式II的化合物,如3-O-芳基-4-C-羟甲基-1,2-邻 - 异丙叉-α-D-呋喃核糖,通式Ⅲ的中间体适用于与甲硅烷基化的核碱基偶联。 在形成的[2.2.1]双环核苷上进行一锅碱诱导的闭环和脱磺化,证明了向腺苷,胞嘧啶,尿苷,胸苷和胍的每个LNA(锁定核酸)衍生物的短路径。 使用5'-磺化的闭环中间体还可以合成5'-氨基和硫代-LNA
    • 3. 发明授权
    • Synthesis of [2.2.1]bicyclo nucleosides
    • [2.2.1]双环核苷的合成
    • US06639059B1
    • 2003-10-28
    • US09534769
    • 2000-03-24
    • Alexei KochkineJef FensholdtHenrik M. Pfundheller
    • Alexei KochkineJef FensholdtHenrik M. Pfundheller
    • C07H1500
    • C07H19/06C07H19/16
    • A synthesis of [2.2.1]bicyclo nucleosides which is shorter and provides higher overall yields proceeds via the key intermediate of the general formula III, wherein R4 and R5 are, for instance, sulfonates and R7 is, for instance, a halogen or an acetate. From compounds of the general formula II, such as 3-O-aryl-4-C-hydroxymethyl-1,2-O-isopropylidene-&agr;-D-ribofuranose, intermediates of the general formula III are suitable for coupling with silylated nucleobases. Upon one-pot base-induced ring-closure and desulfonation of the formed [2.2.1]bicyclo nucleoside, a short route to each the LNA (Locked Nucleic Acid) derivatives of adenosine, cytosine, uridine, thymidine and guanidine is demonstrated. The use of the 5′-sulfonated ring-closed intermediate also allows for synthesis of 5′-amino- and thio-LNAs.
    • 较短且提供更高总产率的[2.2.1]双环核苷的合成通过通式III的关键中间体进行,其中R 4和R 5为例如磺酸盐,且R 7为例如卤素或 乙酸盐。 从通式II的化合物,如3-O-芳基-4-C-羟甲基-1,2-邻 - 异丙叉-α-D-呋喃核糖,通式Ⅲ的中间体适用于与甲硅烷基化的核碱基偶联。 在形成的[2.2.1]双环核苷上进行一锅碱诱导的闭环和脱磺化,证明了向腺苷,胞嘧啶,尿苷,胸苷和胍的每个LNA(锁定核酸)衍生物的短路径。 使用5'-磺化的闭环中间体还可以合成5'-氨基和硫代-LNA。