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【结 构 式】 
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【分子编号】40000 【品名】[(2S,3S,3aR,9aS)-3-(benzoyloxy)-6-oxo-2,3,3a,9a-tetrahydro-6H-furo[2',3':4,5][1,3]oxazolo[3,2-a]pyrimidin-2-yl]methyl benzoate 【CA登记号】 |
【 分 子 式 】C23H18N2O7 【 分 子 量 】434.4052 【元素组成】C 63.59% H 4.18% N 6.45% O 25.78% |
合成路线1
该中间体在本合成路线中的序号：(XIX)Reaction of L-arabinose (XIII) with cyanamide (XIV) in aqueous methanolic ammonia gives the oxazolidine derivative (XV), which is cyclized with methyl propynoate (XVI) in refluxing ethanol to yield the anhydro uridine (XVII). Acylation of both OH groups of (XVII) by means of benzoyl cyanide (XVIII) in DMF affords the dibenzoate (XIX), which is treated with anhydrous HCl in DMF to provide the chloro uridine derivative (XX) or with HI in DMF or LiI and BH3/Et2O in DMF to provide the iodo uridine (XXI). Dehalogenation of (XX) or (XXI) by means of tri-butyltin hydride in refluxing benzene furnishes 3',5'-di-O-benzoyl-2'-deoxy-b-L-uridine (XXII). The trans-glycosylation of (XXII) with bis(trimethylsilyl)-5-fluorouracil (XXIII) by means of TMS-OTf in acetonitrile gives the corresponding 5-fluoro-L-uridine derivative (XXIV) as a mixture of the a- and b-anomers that is separated by chromatography. Debenzoylation of (XXIV) with ammonia in methanol yields 2'-deoxy-b-L-uridine (XXV), which is treated with MsCl and pyridine to afford the dimesylate (XXVI). Reaction of compound (XXVI) with NaOH in methanol/water provides the unstable intermediate (XXVII) that rearranges to the cyclic ether (XXVIII). Treatment of (XXVIII) with 1,2,4-triazole (XXIX) and p-chlorophenyl dichlorophosphate in pyridine provides the adduct (XXX), which by cleavage of the triazole ring by means of NH4OH in dioxane gives the corresponding cytidine derivative (XXXI). Finally, this compound is treated with potassium tert-butoxide in DMSO.
| 【3】 Gullen, E.; Zhu, Y.-L.; Liu, M.-C.; Dutschman, G.E.; Cheng, Y.-C.; Luo, M.-Z.; Lin, T.-S.; Design and synthesis of 2',3'-dideoxy-2',3'-didehydro-beta-L-cytidine (beta-L-d4C) and 2',3'-dideoxy-2',3'-didehydro-beta-L-5-fluorocytidine (beta-L-Fd4C), two exceptionally potent inhibitors of human hepatitis B virus (HBV) and potent inhibitors of human. J Med Chem 1996, 39, 9, 1757. |
| 【1】 Holy, A.; Nucleic acid components and their analogues. CLIII. Preparation of 2'-deoxy-L-ribonucleosides of the pyrimidine series. Coll Czech Chem Commun 1972, 37, 12, 4072. |
| 【2】 Bayes, M.; Sorbera, L.A.; Castaner, J.; ACH-126443. Drugs Fut 2002, 27, 12, 1131. |
| 【4】 Lin, T.-S.; Cheng, Y.-C. (Yale University); L-2',3'-Dideoxy nucleoside analogs as anti-hepatitis B (HBV) and anti-HIV agents. EP 0707481; JP 1996510747; US 5627160; WO 9427616 . |
| 中间体序号 | 中间体编号 | 品名 | CAS号 | 分子式 | 供应商 | 用于合成 |
|---|---|---|---|---|---|---|
| (XIII) | 56917 | alpha-L-arabinofuranose | C5H10O5 | 详情 | 详情 | |
| (XIV) | 19648 | Cyanamide | 420-04-2 | CH2N2 | 详情 | 详情 |
| (XV) | 56918 | (3aS,5S,6S,6aR)-5-(hydroxymethyl)-2-iminohexahydrofuro[2,3-d][1,3]oxazol-6-ol | C6H10N2O4 | 详情 | 详情 | |
| (XVI) | 19588 | methyl propiolate | 922-67-8 | C4H4O2 | 详情 | 详情 |
| (XVII) | 39999 | (2S,3S,3aR,9aS)-3-hydroxy-2-(hydroxymethyl)-2,3,3a,9a-tetrahydro-6H-furo[2',3':4,5][1,3]oxazolo[3,2-a]pyrimidin-6-one | 3736-77-4 | C9H10N2O5 | 详情 | 详情 |
| (XVIII) | 56919 | 2-oxo-2-phenylacetonitrile | C8H5NO | 详情 | 详情 | |
| (XIX) | 40000 | [(2S,3S,3aR,9aS)-3-(benzoyloxy)-6-oxo-2,3,3a,9a-tetrahydro-6H-furo[2',3':4,5][1,3]oxazolo[3,2-a]pyrimidin-2-yl]methyl benzoate | C23H18N2O7 | 详情 | 详情 | |
| (XX) | 40001 | [(2S,3S,4S,5S)-3-(benzoyloxy)-4-chloro-5-[2,4-dioxo-3,4-dihydro-1(2H)-pyrimidinyl]tetrahydro-2-furanyl]methyl benzoate | C23H19ClN2O7 | 详情 | 详情 | |
| (XXI) | 56920 | {(2S,3S,4S,5S)-3-(benzoyloxy)-5-[2,4-dioxo-3,4-dihydro-1(2H)-pyrimidinyl]-4-iodotetrahydro-2-furanyl}methyl benzoate | C23H19IN2O7 | 详情 | 详情 | |
| (XXII) | 39996 | [(2S,3R,5S)-3-(benzoyloxy)-5-[2,4-dioxo-3,4-dihydro-1(2H)-pyrimidinyl]tetrahydro-2-furanyl]methyl benzoate | C23H20N2O7 | 详情 | 详情 | |
| (XXIII) | 47859 | 5-fluoro-2-[(trimethylsilyl)oxy]-4-pyrimidinyl trimethylsilyl ether; 5-fluoro-2,4-bis[(trimethylsilyl)oxy]pyrimidine | 17242-85-2 | C10H19FN2O2Si2 | 详情 | 详情 |
| (XXIV) | 56921 | {(2S,3R,5S)-3-(benzoyloxy)-5-[5-fluoro-2,4-dioxo-3,4-dihydro-1(2H)-pyrimidinyl]tetrahydro-2-furanyl}methyl benzoate | C23H19FN2O7 | 详情 | 详情 | |
| (XXV) | 54714 | 5-fluoro-1-[(2S,4R,5S)-4-hydroxy-5-(hydroxymethyl)tetrahydro-2-furanyl]-2,4(1H,3H)-pyrimidinedione | C9H11FN2O5 | 详情 | 详情 | |
| (XXVI) | 54709 | {(2S,3R,5S)-5-[5-fluoro-2,4-dioxo-3,4-dihydro-1(2H)-pyrimidinyl]-3-[(methylsulfonyl)oxy]tetrahydro-2-furanyl}methyl methanesulfonate | C11H15FN2O9S2 | 详情 | 详情 | |
| (XXVII) | 54710 | [(1S,9S,10S)-4-fluoro-5-oxo-8,11-dioxa-2,6-diazatricyclo[7.2.1.0~2,7~]dodeca-3,6-dien-10-yl]methyl methanesulfonate | C10H11FN2O6S | 详情 | 详情 | |
| (XXVIII) | 54711 | 1-[(1S,3S,5S)-2,6-dioxabicyclo[3.2.0]hept-3-yl]-5-fluoro-2,4(1H,3H)-pyrimidinedione | C9H9FN2O4 | 详情 | 详情 | |
| (XXIX) | 13135 | 1H-1,2,4-Triazole; 1,2,4-Triazole | 288-88-0 | C2H3N3 | 详情 | 详情 |
| (XXX) | 54712 | 1-[(1S,3S,5S)-2,6-dioxabicyclo[3.2.0]hept-3-yl]-5-fluoro-4-(1H-1,2,4-triazol-1-yl)-2(1H)-pyrimidinone | C11H10FN5O3 | 详情 | 详情 | |
| (XXXI) | 54713 | 4-amino-1-[(1S,3S,5S)-2,6-dioxabicyclo[3.2.0]hept-3-yl]-5-fluoro-2(1H)-pyrimidinone | C9H10FN3O3 | 详情 | 详情 |
合成路线2
该中间体在本合成路线中的序号：(XIV)In an alternative procedure, reaction of L-arabinose (X) with cyanamide in the presence of ammonium hydroxide produced the cyclic isourea (XI). Subsequent cycloaddition of methyl propiolate (XII) to (XI) generated the fused pyrimidone system (XIII). After protection of the free hydroxyl groups of (XIII) as the dibenzoate ester (XIV), treatment with HCl in DMF furnished uridine derivative (XV). Dechlorination of (XV) employing Bu3SnH and AIBN afforded intermediate (VIII), which was treated with Lawesson's reagent to give the thiocarbonyl analogue (IX). Finally, sulfur displacement with concomitant benzoate ester hydrolysis employing methanolic ammonia at 100 C in a pressure bomb furnished the title compound.
| 【1】 Bryant, M.L.; Gosselin, G.; Imbach, J.-L. (CNRS (Centre National de la Recherche Scientifique); Novirio Pharmaceuticals Ltd.); beta-L-2'-Deoxy-nucleosides for the treatment of hepatitis B. WO 0009531 . |
| 中间体序号 | 中间体编号 | 品名 | CAS号 | 分子式 | 供应商 | 用于合成 |
|---|---|---|---|---|---|---|
| (VIII) | 39996 | [(2S,3R,5S)-3-(benzoyloxy)-5-[2,4-dioxo-3,4-dihydro-1(2H)-pyrimidinyl]tetrahydro-2-furanyl]methyl benzoate | C23H20N2O7 | 详情 | 详情 | |
| (IX) | 40005 | [(2S,3R,5S)-3-(benzoyloxy)-5-[2-oxo-4-thioxo-3,4-dihydro-1(2H)-pyrimidinyl]tetrahydro-2-furanyl]methyl benzoate | C23H20N2O6S | 详情 | 详情 | |
| (X) | 39997 | (3R,4R,5S)-5-(hydroxymethyl)tetrahydro-2,3,4-furantriol | C5H10O5 | 详情 | 详情 | |
| (XI) | 39998 | (3aS,5S,6S,6aR)-2-amino-5-(hydroxymethyl)-3a,5,6,6a-tetrahydrofuro[2,3-d][1,3]oxazol-6-ol | C6H10N2O4 | 详情 | 详情 | |
| (XII) | 19588 | methyl propiolate | 922-67-8 | C4H4O2 | 详情 | 详情 |
| (XIII) | 39999 | (2S,3S,3aR,9aS)-3-hydroxy-2-(hydroxymethyl)-2,3,3a,9a-tetrahydro-6H-furo[2',3':4,5][1,3]oxazolo[3,2-a]pyrimidin-6-one | 3736-77-4 | C9H10N2O5 | 详情 | 详情 |
| (XIV) | 40000 | [(2S,3S,3aR,9aS)-3-(benzoyloxy)-6-oxo-2,3,3a,9a-tetrahydro-6H-furo[2',3':4,5][1,3]oxazolo[3,2-a]pyrimidin-2-yl]methyl benzoate | C23H18N2O7 | 详情 | 详情 | |
| (XV) | 40001 | [(2S,3S,4S,5S)-3-(benzoyloxy)-4-chloro-5-[2,4-dioxo-3,4-dihydro-1(2H)-pyrimidinyl]tetrahydro-2-furanyl]methyl benzoate | C23H19ClN2O7 | 详情 | 详情 |
合成路线3
该中间体在本合成路线中的序号：(XVIII)Cyclization of L-arabinose (VI) with cyanamide and NH3 in methanol gives the bicyclic oxazoline (XV), which is submitted to a cycloaddition with methyl propynoate (XVI) in refluxing ethanol/water to yield the tricyclic pyrimidinone system (XVII). Benzoylation of the two OH groups of compound (XVII) with either benzoyl cyanide and triethylamine in DMF or benzoyl chloride in anhydrous pyridine affords the dibenzoate (XVIII), which is treated with HCl in hot DMF to provide the chlorouridine derivative (XIX). Dechlorination of compound (XIX) by means of Bu3SnH and AIBN in refluxing benzene gives 3,5-di-O-benzoyl-2'deoxy-b-L-uridine (XX), which is debenzoylated by means of NaOMe in methanol to yield 2'-deoxy-b-L- uridine (XXI). Finally, this compound is methylated by reaction with formaldehyde and KOH in hot water followed by hydrogenation with H2 over Pd/C in EtOH/HCl. Optionally, telbivudine can be purified by benzoylation with benzoyl cyanide and TEA, crystallization in EtOH/ether and final hydrolysis with refluxing MeOH/ NaOMe.
| 【1】 Sorbera, L.A.; Castañer, J.; Castañer, R.M.; Bayes, M.; Telbivudine. Drugs Fut 2003, 28, 9, 870. |
| 【2】 Holy, A.; Nucleic acid components and their analogues. CLIII. Preparation of 2'-deoxy-L-ribonucleosides of the pyrimidine series. Coll Czech Chem Commun 1972, 37, 12, 4072. |
| 【3】 Bryant, M.L.; Gosselin, G.; Imbach, J.-L. (CNRS (Centre National de la Recherche Scientifique); Novirio Pharmaceuticals Ltd.); beta-L-2'-Deoxy-nucleosides for the treatment of hepatitis B. WO 0009531 . |
| 【4】 Weis, A.L.; Goodhue, C.T.; Shanmuganathan, K. (Genencor International, Inc.); L-Ribofuranosyl nucleosides. WO 9613512 . |
| 中间体序号 | 中间体编号 | 品名 | CAS号 | 分子式 | 供应商 | 用于合成 |
|---|---|---|---|---|---|---|
| (VI) | 62914 | (4R,5S)-5-(hydroxymethyl)tetrahydro-2,4-furandiol | C5H10O4 | 详情 | 详情 | |
| (XV) | 56918 | (3aS,5S,6S,6aR)-5-(hydroxymethyl)-2-iminohexahydrofuro[2,3-d][1,3]oxazol-6-ol | C6H10N2O4 | 详情 | 详情 | |
| (XVI) | 19588 | methyl propiolate | 922-67-8 | C4H4O2 | 详情 | 详情 |
| (XVII) | 39999 | (2S,3S,3aR,9aS)-3-hydroxy-2-(hydroxymethyl)-2,3,3a,9a-tetrahydro-6H-furo[2',3':4,5][1,3]oxazolo[3,2-a]pyrimidin-6-one | 3736-77-4 | C9H10N2O5 | 详情 | 详情 |
| (XVIII) | 40000 | [(2S,3S,3aR,9aS)-3-(benzoyloxy)-6-oxo-2,3,3a,9a-tetrahydro-6H-furo[2',3':4,5][1,3]oxazolo[3,2-a]pyrimidin-2-yl]methyl benzoate | C23H18N2O7 | 详情 | 详情 | |
| (XIX) | 40001 | [(2S,3S,4S,5S)-3-(benzoyloxy)-4-chloro-5-[2,4-dioxo-3,4-dihydro-1(2H)-pyrimidinyl]tetrahydro-2-furanyl]methyl benzoate | C23H19ClN2O7 | 详情 | 详情 | |
| (XX) | 39996 | [(2S,3R,5S)-3-(benzoyloxy)-5-[2,4-dioxo-3,4-dihydro-1(2H)-pyrimidinyl]tetrahydro-2-furanyl]methyl benzoate | C23H20N2O7 | 详情 | 详情 | |
| (XXI) | 11875 | 1-[(2R,4S,5R)-4-Hydroxy-5-(hydroxymethyl)tetrahydro-2-furanyl]-2,4(1H,3H)-pyrimidinedione; 2'-Deoxyuridine | 951-78-0 | C9H12N2O5 | 详情 | 详情 |