- Design, synthesis, and biological evaluation of novel 2′-deoxy-2′-fluoro-2′-C-methyl 8-azanebularine derivatives as potent anti-HBV agents
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Hepatitis B virus (HBV) is a global health problem requiring more efficient and better tolerated anti-HBV agent. In this paper, a series of novel 2′-deoxy-2′-fluoro-2′-C-methyl-β-D-arabinofuranosyl 8-azanebularine analogues (1 and 2a) and N4-su
- Yang, Wu,Peng, Youmei,Wang, Jingwen,Song, Chuanjun,Yu, Wenquan,Zhou, Yubing,Jiang, Jinhua,Wang, Qingduan,Wu, Jie,Chang, Junbiao
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Read Online
- Novel nucleoside analogues as effective antiviral agents for Zika virus infections
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Previously considered a neglected flavivirus, Zika virus has recently emerged as a public health concern due to its ability to spread rapidly and cause severe neurological disorders, such as microcephaly in newborn babies from infected mothers, and Guilla
- Bassetto, Marcella,Basso, Mattia,Brancale, Andrea,Bugert, Joachim J.,Cima, Cecilia M.,Friese, Daniela,Salerno, Martina,Schwarze, Frank
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- Preparation method of anti-hepatitis C medicine sofosbuvir
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The invention discloses a preparation method of an anti-hepatitis C medicine sofosbuvir. The method comprises the following steps: taking r-ethyl glycerate acetonide as an initial raw material, enabling the r-ethyl glycerate acetonide to react with ethyl alpha-fluoropropionate under the action of potassium tert-butoxide, performing carbonyl reduction, hydroxyl acylation, hydrolytic cyclization under an acidic condition, hydroxyl acylation, red aluminum reduction and chiral column separation so as to obtain a sofosbuvir key intermediate ((2R,3R,4R,5R)-3-(benzoyloxy)-5-hydroxy-4-fluoro-4-methyltetrahydrofuran-2-yl) methyl benzoate, performing 2-hydroxyl acetylation, enabling acetylized material to react with 2-trimethylsiloxy-4-benzamidopyrimidine, removing benzamido under an acidic condition, performing dehydroxylation protection, and finally enabling obtained material to react with N-[(S)-(2,3,4,5,6-Pentafluorophenoxy)phenoxyphosphinyl]-L-alanine 1-methylethyl ester to obtain the sofosbuvir. The method has the advantages of short synthesis route, high yield, avoidance of a fluorination reaction step in the synthesis process, and mild synthesis reaction conditions.
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Paragraph 0052; 0063-0064
(2020/07/02)
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- SUBSTITUTED NUCLEOSIDES, NUCLEOTIDES AND ANALOGS THEREOF
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Disclosed herein are nucleotide analogs, methods of synthesizing nucleotide analogs and methods of treating diseases and/or conditions such as a Picornaviridae and/or Flaviviridae viral infections with one or more nucleotide analogs.
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Paragraph 0307
(2018/03/06)
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- Synthesis method of sofosbuvir
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The invention provides a synthesis method of sofosbuvir. The synthesis method of the sofosbuvir comprises the following steps: performing mitsunobu reaction on ((2R,3R,4R)-3-benzoyloxy)-4-fluorine-5-hydroxyl-4-methyltetrahydrofuran-2-yl)methyl benzoate to produce sulfonate to obtain a compound 1; abutting the compound 1 and N-benzoylcytosine to produce a compound 2. The method adopts mitsunobu reaction to avoid production of an isomer, and the isomer is reduced to 5 percent or below; according to the method, sulfonate and N-benzoylcytosine are abutted, so the use ofa stannic chloride raw material is avoided; furthermore, the yield is high and few solid waste is generated during aftertreatment, so that the method is suitable for large-scale industrialized production.
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Paragraph 0043; 0044
(2017/07/19)
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- The synthesis of hydroxyaminopurine nucleosied (by machine translation)
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A compound or salt thereof having the following structure useful for the treatment of hepatitis C virus (HCV): wherein R 7 is C 1-6 alkyl or C 3-6 cycloalkyl and R 8 is -O(C 1-6 alkyl) or -O(C 3-6 cycloalkyl).
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Paragraph 0214; 0215
(2016/10/10)
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- Stereoselective synthesis of PSI-352938: A β-D -2′-deoxy- 2′-α-fluoro-2′-β-C-methyl-3′,5′-cyclic phosphate nucleotide prodrug for the treatment of HCV
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PSI-352938 is a novel 2′-deoxy-2′-α-fluoro-2′- β-C-methyl 3′,5′-cyclic phosphate nucleotide prodrug currently under investigation for the treatment of hepatitis C virus (HCV) infection. PSI-352938 demonstrated superior characteristics in vitro that include broad genotype coverage, superior resistance profile, and high levels of active triphosphate in vivo in the liver compared to our first and second generation nucleoside inhibitors of this class. Consequently, PSI-352938 was selected for further development and an efficient and scalable synthesis was sought to support clinical development. We report an improved, diastereoselective synthesis of a key 1′-β-nucleoside intermediate 13 via SN2 displacement of 1-α-bromo ribofuranose sugar 16 with the potassium salt of 6-chloro-2-amino purine and an efficient method to prepare cis-Rp cyclic phosphate (PSI-352938) in a highly stereoselective manner without any chromatographic purification. The 1-α-bromo sugar 16 was stereospecifically prepared from the corresponding 1-β-lactol in high yield under mild bromination conditions using CBr4/PPh3 (Appel reaction). The desired cis-Rp 3′,5′-cyclic phosphate construction was accomplished using isopropyl phosphorodichloridate readily obtained from POCl3 and isopropyl alcohol. The base combination of Et 3N/NMI was identified as a key factor for producing PSI-352938 as the major (>95%) diastereomer (cis-Rp) in high yield after the final cyclization step. The current route described in this article was successfully used to produce PSI-352938 on multikilogram scale.
- Reddy, P. Ganapati,Chun, Byoung-Kwon,Zhang, Hai-Ren,Rachakonda, Suguna,Ross, Bruce S.,Sofia, Michael J.
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experimental part
p. 3782 - 3790
(2011/07/08)
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- NUCLEOSIDE ANALOGS
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A purified compound having activity against hepatitis C virus is disclosed.
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Page/Page column 21-22
(2010/07/09)
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