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    • 2. 发明授权
    • Methods for preparing antiviral calanolide compounds
    • 制备抗病毒胼cal体化合物的方法
    • US06420571B2
    • 2002-07-16
    • US09918674
    • 2001-07-31
    • Ze-Qi XuHongwei YuanJennifer CrabbRaghu SamyAiling LiHua Cao
    • Ze-Qi XuHongwei YuanJennifer CrabbRaghu SamyAiling LiHua Cao
    • C07D49304
    • C07D493/04C07D493/14
    • The present invention relates to methods for preparing 2,2-dimethyl-5-acyloxy -10-propyl-2H,8H-benzo[1,2-b:3,4-b′]dipyran-8-one (5) and 2,2-dimethyl-5-hydroxy-10 -propyl-2H,8H-benzo[1,2-b:3,4-b′]dipyran-8-one (6) and their use as intermediates for the synthesis of antiviral calanolide compounds. For example, Fries rearrangement on compound 5 or Friedel-Crafts reaction on 6, yields intermediate 2,2-dimethyl-5-hydroxy -6-propionyl-10-propyl-2H,8H-benzo[1,2-b:3,4-b′]dipyran-8-one (4), which, in turn, can be converted to (+)-calanolide A and (−)-calanolide B. The coupling of compound 6 with the appropriate chiral molecule under Mitsunobu or nucleophilic displacement leads to the asymmetric synthesis of antiviral calanolide compounds.
    • 本发明涉及制备2,2-二甲基-5-酰氧基-10-丙基-2H,8H-苯并[1,2-b:3,4-b']二吡喃-8-酮(5)的方法和 2,2-二甲基-5-羟基-10-丙基-2H,8H-苯并[1,2-b:3,4-b']二吡喃-8-酮(6)及其作为合成 抗病毒胼cal体化合物。 例如,化合物5上的Fries重排或6上的Friedel-Crafts反应产生中间体2,2-二甲基-5-羟基-6-丙酰基-10-丙基-2H,8H-苯并[1,2-b:3, 4-b']二吡喃-8-酮(4),其依次可以转化为(+) - 卡立拉内酯A和( - ) - 甘露糖苷B。化合物6与适当的手性分子在Mitsunobu或 亲核取代导致抗病毒胼cal体化合物的不对称合成。
    • 3. 发明申请
    • THERMOSENSITIVE IMAGING COMPOSITION AND LITHOGRAPHIC PLATE COMPRISING THE SAME
    • 耐热成像组合物和包含该组合物的平版印刷板
    • US20110271859A1
    • 2011-11-10
    • US13142213
    • 2009-12-24
    • Shiyou LiHongwei Yuan
    • Shiyou LiHongwei Yuan
    • B41N1/08
    • C08G14/06B41C1/1008B41C2210/02B41C2210/06B41C2210/22B41C2210/262B41M5/368C08G14/08C08L61/34
    • The present application relates to a positive-working heat-sensitive lithographic plate. The infrared heat-sensitive image recording composition of the plate comprises a resin having self-dissolution inhibiting property and an infrared absorber. The resin having self-dissolution inhibiting property is an alkali-soluble resin that contains phenolic hydroxyl group, and carbamate or thiocarbamate group that has strong electron-absorbing ability. The advantage of the present application is that it requires no dissolution inhibitor when preparing the infrared positive-working heat-sensitive CTP plate. The mechanism could be understood but not limited to that the carbamate or thiocarbamate group contained in the resin has a dissolution inhibiting effect on the phenolic hydroxyl group in the resin, reducing the solubility of the resin in an alkali solution. When the plate is irradiated by an infrared laser, the infrared radiation transformed into heat, and since the above dissolution inhibiting effect would be impaired under high temperature, the solubility of the resin in an alkali solution can be restored.
    • 本申请涉及一种正性热敏平版印刷版。 板的红外热敏图像记录组合物包括具有自溶性抑制性质的树脂和红外吸收剂。 具有自溶性抑制性的树脂是含有酚羟基的碱溶性树脂和具有强电子吸收能力的氨基甲酸酯或硫代氨基甲酸酯基。 本申请的优点是在制备红外线正性热敏CTP板时不需要溶解抑制剂。 该机理可以理解为但不限于树脂中所含的氨基甲酸酯或硫代氨基甲酸酯基对树脂中的酚羟基具有溶解抑制作用,降低了树脂在碱溶液中的溶解度。 当通过红外激光器照射板时,红外辐射转变成热,并且由于上述溶解抑制作用在高温下会受损,所以可以恢复树脂在碱溶液中的溶解度。
    • 6. 发明授权
    • Methods for preparing antiviral calanolide compounds
    • 制备抗病毒胼cal体化合物的方法
    • US06369241B1
    • 2002-04-09
    • US09557821
    • 2000-04-25
    • Ze-Qi XuHongwei YuanJennifer CrabbRaghu SamyAiling LiHua Cao
    • Ze-Qi XuHongwei YuanJennifer CrabbRaghu SamyAiling LiHua Cao
    • C07D31122
    • C07D493/04C07D493/14
    • The present invention relates to methods for preparing 2,2-dimethyl-5-acyloxy-10-propyl-2H,8H-benzo[1,2-b:3,4-b′]dipyran-8-one (5) and 2,2-dimethyl-5-hydroxy-10-propyl-2H,8H-benzo[1,2-b:3,4-b′]dipyran-8-one (6) and their use as intermediates for the synthesis of antiviral calanolide compounds. For example, Fries rearrangement on compound 5 or Friedel-Crafts reaction on 6, yields intermediate 2,2-dimethyl-5-hydroxy-6-propionyl-10-propyl-2H,8H-benzo[1,2-b:3,4-b′]dipyran-8-one (4), which, in turn, can be converted to (+)-calanolide A and (−)-calanolide B. The coupling of compound 6 with the appropriate chiral molecule under Mitsunobu or nucleophilic displacement leads to the asymmetric synthesis of antiviral calanolide compounds.
    • 本发明涉及制备2,2-二甲基-5-酰氧基-10-丙基-2H,8H-苯并[1,2-b:3,4-b']二吡喃-8-酮(5)的方法和 2,2-二甲基-5-羟基-10-丙基-2H,8H-苯并[1,2-b:3,4-b']二吡喃-8-酮(6)及其作为合成中间体的用途 抗病毒胼cal体化合物。 例如,化合物5上的Fries重排或6上的Friedel-Crafts反应产生中间体2,2-二甲基-5-羟基-6-丙酰基-10-丙基-2H,8H-苯并[1,2-b:3, 4-b']二吡喃-8-酮(4),其依次可以转化为(+) - 卡立拉内酯A和( - ) - 甘露糖苷B。化合物6与适当的手性分子在Mitsunobu或 亲核取代导致抗病毒胼cal体化合物的不对称合成。