合成路线:Uracil (I) was silylated with hexamethyldisilazan,and the resulting bis-silylated uracil (II) was condensed with protected xylofuranose (III) in the presence of trimethylsilyl triflate to afford nucleoside (IV).Selective hydrolysis of the acetate ester of (IV) employing hydrazine and AcOH in pyridine yielded (V).Isomerization of xylofuranosyl uracil (V) to the arabinofuranosyl analogue (VI) was achieved by reaction with dicyclohexylcarbodiimide and dichloroacetic acid followed by treatment with NaBH4.Subsequent deoxygenation of the 2'-hydroxyl group of (VI) was effected via condensation with phenyl chlorothionoformate,and then reduction of the resulting thiocarbonate (VII) with tris(trimethylsilyl)silane and azobis(isobutyronitrile) (AIBN).The resultant 2'-deoxyuridine derivative (VIII) 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.
合成路线: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.
合成路线: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.
合成路线:Reaction of L-xylose (XXII) with acetone and H2SO4 gives the acetonide (XXIII),which by acylation with benzoyl chloride in pyridine/chloroform yields the dibenzoate (XXIV).The hydrolysis of acetonide (XXIV) with acetic acid to the dihydroxy sugar (XXV) followed by acylation with acetic anhydride provides the tetracylated L-xylose (XXVI).Condensation of compound (XXVI) with 2,4-bis(trimethylsilyloxy)pyrimidine (XXVII) - obtained by silylation of uracil (XXVIII) with hexamethyldisilazane - by means of trimethylsilyl triflate in 1,2-dichloroethane affords nucleoside (XXIX).Selective hydrolysis of the acetate ester of compound (XXIX) using hydrazine and AcOH in pyridine yields the dibenzoylated xylofuranosyl-uracil (XXX).Isomerization of compound (XXX) to the arabinofuranosyl analogue (XXXI) is achieved by reaction with dicyclohexylcarbodiimide and dichloroacetic acid in DMSO/benzene,followed by treatment with NaBH4 in EtOH/benzene.Subsequent deoxygenation of the 2'-hy-droxyl group of compound (XXXI) to afford 2'-deoxynucleoside (XX) is effected via condensation with phenyl chlorothionoformate,and then reduction of the resulting thiocarbonate (XXXII) with tris(trimethylsilyl)silane and AIBN.Iodination of the uracil ring of (XX) with I2 and cerium ammonium nitrate (CAN) in acetonitrile produces the 5-iodo derivative (XXXIII),which is protected at the 3-nitrogen atom by condensation with p-toluoyl chloride to yield the protected nucleoside (XXXIV).Introduction of the 5-methyl group to give the thymidine derivative (XXXV) is then effected by reaction of the 5-iodouracil (XXXIV) with tetramethyltin in the presence of palladium catalyst.Finally,all protecting groups of compound (XXXV) are removed by treatment with methanolic ammonia.
参考文献标题:beta-L-2'-Deoxy-nucleosides for the treatment of hepatitis B
文献作者:Bryant,M.L.; Gosselin,G.; Imbach,J.-L.(CNRS (Centre National de la Recherche Scientifique); Novirio Pharmaceuticals Ltd.)
参考来源:WO 0009531
合成路线:By reaction of theophylline-7-acetaldehyde (I) with ethylene glycol (II) by means of p-toluenesulfonic acid in refluxing benzene.
合成路线:Condensation of 1-(b-L-ribofuranosyl)thymine (XXXVI) with 1,3-dichloro-1,1,3,3-tetraisopropyldisiloxane (XXXVII) in pyridine gives the cyclic disiloxane nucleoside (XXXVIII),which is acylated with thiocarbonyldiimidazole (TCDI) in DMF to yield the 2'-O-thioester derivative (XXXIX).Reduction of this compound by means of 2,2'-azobis(methylpropionitrile) (ABMP) and Bu3SnH in refluxing toluene affords the silylated 2'-deoxynucleoside (XL),which is finally desilylated by means of TBAF in THF.
参考文献标题:Dimeric cpds.and their use as anti-viral agents
文献作者:Dowle,M.D.; Wu,W.-Y.; Jin,B.; Mason,A.M.; McConnell,D.; MacDonald,S.J.F.; Shanahan,S.E.; Nguyen,V.T.T.(Biota Scientific Management Pty Ltd.)
参考来源:WO 0340135
合成路线: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.
参考文献标题:L-Ribofuranosyl nucleosides
文献作者:Weis,A.L.; Goodhue,C.T.; Shanmuganathan,K.(Genencor International,Inc.)
参考来源:WO 9613512
合成路线:Condensation of the bicyclic oxazoline (XV) with 2-(chloromethyl)acrylic acid ethyl ester (XLI) - obtained by treatment of the hydroxymethyl analogue (XLII) with SOCl2 - in dimethylacetamide gives the aduct (XLIII),which is treated first with hydroquinone and Na2CO3 in water and then with H2 over Pd/Al2O3 in the same solvent to provide 2,2'-anhydro-b-L-thymidine (XLIV).Reaction of compound (XLIV) with acetyl bromide in DMF/AcOEt yields 2'-bromo-3',5'-di-O-acetyl-b-L-thymidine (XLV),which is debrominated with H2 over Pd/Al2O3.to afford the 2'-deoxynucleoside (XLVI).Finally,this compound is deacetylated by means of NH3 in MeOH.
参考文献标题:L-Nucleic acid derivs.and processes for the synthesis thereof
文献作者:Suzuki,T.; Iizuka,H.; Togashi,K.(Mitsui Chemicals,Inc.)
参考来源:EP 1348712; JP 2002241390; WO 0244194
合成路线: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.
合成路线: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.
参考文献标题:Nucleic acid components and their analogues.CLIII.Preparation of 2'-deoxy-L-ribonucleosides of the pyrimidine series
文献作者:Holy,A.
参考来源:Coll Czech Chem Commun 1972,37(12),4072
合成路线:The oxidative cleavage of 1,2,5,6-di-O-isopropylidene-D-galactofuranose (XLVII) with NaIO4 and H5IO6 gives aldehyde (XLVIII),which is reduced with NaBH4 in methanol to yield the 1,2-di-O-isopropylidene-L-arabinose (XLIX).Protection of the OH groups of compound (XLIX) with benzyl chloride and KOH in refluxing dioxane affords the dibenzyl ether (L),which is submitted to cleavage of the acetonide group by means of HCl in methanol to provide the methyl dibenzyl-L-arabinoside (LI).Reaction of the free OH group of (LI) with triflic anhydride and pyridine in dichloromethane gives the triflate (LII),which is reduced with Bu4NBH4 in refluxing benzene to yield methyl 3,5-di-O-benzyl-2-deoxy-L-riboside (LIII).Deben-zylation of (LIII) wit H2 over Pd/C affords methyl 2-deoxy-L-riboside (LIV),which is finally treated with Dowex [H+] in hot water to provide the telbivudine intermediate 2-deoxy-L-ribose (VI).
参考文献标题:A stereospecific synthesis of L-deoxyriboside,L-ribose and L-ribosides
文献作者:Shi,Z.-D.; Yang,B.-H.; Wu,Y.-L.
参考来源:Tetrahedron 2002,58(16),3287
产品链接: CAS No. 3424-98-4››