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    • 1. 发明申请
    • Method for Preparing 4-[9-(6-Aminopurine)]-2-(S)-Hydroxyl-Butyric Acid Methyl Ester
    • 4- [9-(6-氨基嘌呤)] - 2-(S) - 羟基 - 丁酸甲酯的制备方法
    • US20110201810A1
    • 2011-08-18
    • US12747312
    • 2008-11-06
    • Fajun NanJianping ZuoYangming ZhangMin GuWei Tang
    • Fajun NanJianping ZuoYangming ZhangMin GuWei Tang
    • C07D473/34
    • C07D473/34Y02P20/55
    • The present invention discloses a novel method for preparing and purifying 4-(6-Amino-purin-9-yl)-2(S)-hydroxy-butyric acid methyl ester. The preparation started from cheap and easily available L-malic acid, which was transformed to intermediate I after simultaneous protection of the groups of 1-carboxyl and 2-hydroxyl. The intermediate I was selectively reduced to intermediate alcohol II, whose hydroxyl group was further transformed to an easily leaving group to afford intermediate III. The intermediate III was nucleophilically substituted with adenine to afford intermediate IV. The intermediate IV was deprotected and methyl-esterified simultaneously in methanol in the presence of an acid or a base to afford crude 4-(6-Amino-purin-9-yl)-2(S)-hydroxy-butyric acid methyl ester, which was purified by recrystallization to afford the purified product. Comparing with the prior preparation methods, the present method has advantages in low cost, mild conditions, high retention of the chiral center during the reaction, high productivity, great improvement in the quality and yield of the product and great decrease in cost, and thus is suitable for the production on a large scale.
    • 本发明公开了一种制备和纯化4-(6-氨基嘌呤-9-基)-2(S) - 羟基 - 丁酸甲酯的新方法。 该制剂从便宜且易于获得的L-苹果酸开始,其在同时保护1-羧基和2-羟基的基团后转化为中间体I. 将中间体I选择性还原成中间体醇II,其中羟基进一步转化为容易离去的基团,得到中间体III。 中间体III用腺嘌呤亲核取代,得到中间体IV。 将中间体IV在酸或碱的存在下在甲醇中同时脱甲基酯化,得到粗制的4-(6-氨基 - 嘌呤-9-基)-2(S) - 羟基 - 丁酸甲酯, 通过重结晶纯化,得到纯化产物。 与现有的制备方法相比,本发明方法具有成本低,条件温和,反应中手性中心保留性高,生产效率高,产品质量和产量大幅提高,成本大幅降低的优点, 适合大规模生产。
    • 2. 发明授权
    • Method for preparing 4-(6-amino-purin-9-YL)-2(S)-hydroxy-butyric acid methyl ester
    • 制备4-(6-氨基嘌呤-9-YL)-2(S) - 羟基 - 丁酸甲酯的方法
    • US08247549B2
    • 2012-08-21
    • US12747312
    • 2008-11-06
    • Fajun NanJianping ZuoYangming ZhangMin GuWei Tang
    • Fajun NanJianping ZuoYangming ZhangMin GuWei Tang
    • C07D473/34
    • C07D473/34Y02P20/55
    • The present invention discloses a novel method for preparing and purifying 4-(6-Amino-purin-9-yl)-2(S)-hydroxy-butyric acid methyl ester. The preparation started from cheap and easily available L-malic acid, which was transformed to intermediate I after simultaneous protection of the groups of 1-carboxyl and 2-hydroxyl. The intermediate I was selectively reduced to intermediate alcohol II, whose hydroxyl group was further transformed to an easily leaving group to afford intermediate III. The intermediate III was nucleophilically substituted with adenine to afford intermediate IV. The intermediate IV was deprotected and methyl-esterified simultaneously in methanol in the presence of an acid or a base to afford crude 4-(6-Amino-purin-9-yl)-2(S)-hydroxy-butyric acid methyl ester, which was purified by recrystallization to afford the purified product. Comparing with the prior preparation methods, the present method has advantages in low cost, mild conditions, high retention of the chiral center during the reaction, high productivity, great improvement in the quality and yield of the product and great decrease in cost, and thus is suitable for the production on a large scale.
    • 本发明公开了一种制备和纯化4-(6-氨基嘌呤-9-基)-2(S) - 羟基 - 丁酸甲酯的新方法。 该制剂从便宜且易于获得的L-苹果酸开始,其在同时保护1-羧基和2-羟基的基团后转化为中间体I. 将中间体I选择性还原成中间体醇II,其中羟基进一步转化为容易离去的基团,得到中间体III。 中间体III被腺嘌呤亲核取代,得到中间体IV。 将中间体IV在酸或碱的存在下在甲醇中同时脱甲基酯化,得到粗制的4-(6-氨基 - 嘌呤-9-基)-2(S) - 羟基 - 丁酸甲酯, 通过重结晶纯化,得到纯化产物。 与现有的制备方法相比,本发明方法具有成本低,条件温和,反应中手性中心保留性高,生产效率高,产品质量和产量大幅提高,成本大幅降低的优点, 适合大规模生产。
    • 10. 发明授权
    • Tripartite fiber-coupled fluorescence instrument
    • 三光纤耦合荧光仪器
    • US07019309B2
    • 2006-03-28
    • US10460188
    • 2003-06-13
    • Min GuDamian Bird
    • Min GuDamian Bird
    • G01N21/64
    • G02B21/082G01N21/6458G02B23/2469G02B23/26
    • A non-linear fluorescence microscope or endoscope includes: (a) a source of coherent light suitable to initiate non-linear fluorescence in a sample of interest located at a sample region; (b) a first light conductor positioned to receive at its terminal light from the light source and direct the light to a coupler; (c) a second light conductor located to receive light introduced to the coupler from the first conductor and direct the light to the sample via a sample end of the second conductor, the sample end also located to receive fluoresced light from the sample such that the second conductor may direct the fluoresced light to the coupler; and (d) a third light conductor located to direct fluoresced light from the coupler to a light detection device via a terminal of the third light conductor.
    • 非线性荧光显微镜或内窥镜包括:(a)适合于在位于样品区域的感兴趣样品中引发非线性荧光的相干光源; (b)第一光导体,定位成在其端子处接收来自光源的光并将光引导到耦合器; (c)第二光导体,其被定位成接收从第一导体引入耦合器的光,并经由第二导体的样品端将光引导到样品,样品端还定位成接收来自样品的荧光,使得 第二导体可以将荧光的光引导到耦合器; 以及(d)第三光导体,其被定位成经由所述第三光导体的端子将来自所述耦合器的荧光的光引导到光检测装置。