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1.
Jack D. Anderson Roland K. Robins Ganapathi R. Revankar 《Nucleosides, nucleotides & nucleic acids》2013,32(5):853-863
Abstract The synthesis of pyrazolo[3,4-d]pyrimidine ribonucleoside 3′, 5′-cyclic phosphates related to cAMP, cIMP and cGMP has been achieved for the first time. Phosphorylation of 4-amino-6-methylthio-1-β-D-ribo-furanosylpyrazolo[3,4-d]pyrimidine (1) with POCl3 in trimethyl phosphate gave the corresponding 5′-phosphate (2a). DCC mediated intramolecular cyclization of 2a gave the corresponding 3′, 5′-cyclic phosphate (3a), which on subsequent dethiation provided the cAMP analog 4-amino-1-β-D-ribofuranosylpyrazolo[3, 4-d]pyrimidine 3′, 5′-cyclic phosphate (3b). A similar phosphorylation of 6-methylthio-1-β-D-ribofuranosylpyrazolo[3, 4-d]pyrimidin-4(5H)-one (5), followed by cyclization with DCC gave the 3′, 5′-cyclic phosphate of 5 (9a). Dethiation of 9a with Raney nickel gave the cIMP analog 1-β-D-ribofuranosylpyrazolo[3, 4-d]pyrimidin-4(5H)-one 3′, 5′-cyclic phosphate (9b). Oxidation of 9a with m-chloroperoxy benzoic acid, followed by ammonolysis provided the cGMP analog 6-amino-1-β-D-ribofuranosylpyrazolo [3, 4-d] pyrimidin-4(5H)-one 3′, 5′-cyclic phosphate (7). The structural assignment of these cyclic nucleotides was made by UV and H NMR spectroscopic studies. 相似文献
2.
Naeem B. Hanna Krishna G. Upadhya Charles R. Petrie Roland K. Robins Ganapathi R. Revankar 《Nucleosides, nucleotides & nucleic acids》2013,32(4):343-362
Abstract The synthesis of several 5′-substituted derivatives of ribavirin (1) and tiazofurin (3) are described. Direct acylation of 1 with the appropriate acyl chloride in pyridine-DMF gave the corresponding 5′-O-acyl derivatives (4a-h). Tosylation of the 2′, 3′-O-isopropylidene-ribavirin (6) and tiazofurin (11) with p-toluenesulfonyl chloride gave the respective 5′-O-p-tolylsulfonyl derivatives (7a and 12a), which were converted to 5′-azido-5′-deoxy derivatives (7b and 12b) by reacting with sodium/lithium azide. Deisopropylidenation of 7b and 12b, followed by catalytic hydrogenation afforded 1-(5-amino-5-deoxy-β-D)-ribofuranosyl)-1, 2, 4-triazole-3-carboxamide (10b) and 2 - (5 -amino- 5-deoxy- β-D-ribofuranosyl) thiazole-4-carboxamide (16), respectively. Treatment of 6 with phthalimide in the presence of triphenylphosphine and diethyl azodicarboxylate furnished the corresponding 5′-deoxy-5′-phthaloylamino derivative (9). Reaction of 9 with n-butylamine and subsequent deisopropylidenation provided yet another route to 10b. Selective 5′-thioacetylation of 6 and 11 with thiolacetic acid, followed by saponification and deisopropylidenation afforded 5′-deoxy-5′-thio derivatives of 1-β-D-ribofuranosyl-1, 2, 4-triazole-3-carboxamide (8a) and 2-β-D-ribofuranosylthiazole-4-carboxamide (15), respectively. 相似文献
3.
Abstract Selective glycosylation of 4-amino-5H-imidazo [4, 5-c]-1, 2, 6-thiadiazine 2, 2-dioxide (1) through its 1-benzyl derivative (2) is described. The structures of the compounds are discussed on the basis of 1H nmr 2D homonuclear chemical shift correlations, NOE difference spectroscopy and iterative analyses. 相似文献
4.
Steven G. Wood N. Kent Dalley Rose D. George Roland K. Robins Ganapathi R. Revankar 《Nucleosides, nucleotides & nucleic acids》2013,32(2):187-194
Abstract The first chemical synthesis of 3-amino-1-β-D-ribofuranosyl-s-triazolo[5,1-c]-s-triazole (6) is described. Direct glycosylation of 3-amino-5(7)H-s-triazolo[5,1-c]-s-triazole (2) with 1-O-acetyl-2,3,5-tri-O-benzoyl-D-ribofuranose (3) in the presence of TMS-triflate gave 3-amino-1-(2,3,5-tri-O-benzoyl-β-D-ribofuranosyl)-s-triazolo[5, 1-c]-s-triazole (4) which, on ammonolysis, gave 6. The absolute structure of 6 is determined by X-ray diffraction techniques employing Mo Kα radiation. The structure is solved by direct methods and refined to the R value of 0.044 by using a full-matrix least-squares method. The sugar of 6 has a 3T2 configuration. The torsion angles about the C5′–C4′ bond are both gauche and the torsion angle about the glycosidic bond is in the anti range. Each azole ring of the aglycon is planar and the dihedral angle between the planes of the rings is 3.6°. 相似文献
5.
Bozenna Golankiewicz Joanna Zeidler Erik De Clercq 《Nucleosides, nucleotides & nucleic acids》2013,32(4):663-678
Abstract C-acyclic nucleoside analogues of inosine and guanosine 8-[(RS)-2,3-dihydroxypropyl] imidazo [1,5-a]-1,3,5-triazin-4 (3H)-ones 6a, c, d were synthesized. The route involved the cyclization-rearrangement of 5-acylamino-5-allyl-6-amino-4,5-dihydropyrimidin-4-ones 4a-c to 8-allylimidazo [1,5-a]-1,3,5-triazin-4 (3H) ones 5a-c. 5a was transformed selectively into 5d by reductive desulfurization with highly deactivated Raney nickel. The poorly soluble compounds 5b and 5c were converted to N-2-acetylated 5f and 5g. Osmium tetroxide hydroxylation of 5d, f, g gave 6a, c, d. None of the newly synthesized C-acyclic nucleoside derivatives showed an appreciable antiviral or antitumor cell activity. 相似文献
6.
Kambhampati V. B. Rao Wa-Yun Ren Joseph H. Burchenal Robert S. Klein 《Nucleosides, nucleotides & nucleic acids》2013,32(5):539-569
Abstract The syntheses and preliminary biological evaluation of several novel pyrrolo[3,2-d]pyrimidine and thieno[3,2-d]pyrimidine C-nucleosides incorporating the arabinofuranosyl or 2′-deoxyribofuranosyl sugar moiety are described. The 2′-deoxy thieno[3,2-d]pyrimidine C-nucleosides (15 and 16) were obtained from 7-(β-D-ribofuranosyl)-4-oxo-3H-thieno[3,2-d]pyrimidine (3) and its 4-SMe derivative 8. “2”-Deoxy-9-deazaadenosine (31), “9-Deaza ara-A” (38) and the 2′-substituted arabinosyl pyrrolo[3,2-d]pyrimidine C-nucleosides (42 - 44) were synthesized from 4-amino-7-(2,3-O-isopropylidene-5-O-trityl-β-D-ribofuranosyl)-5H-pyrrolo[3,2-d]pyrimidine (21) 相似文献
7.
Julia Castro-pichel Ma. Teresa García-López Rosario Herranz Concepción Pérez 《Nucleosides, nucleotides & nucleic acids》2013,32(7):985-1000
Abstract 5′-O-[N-(Aminoacyl)sulfamoyl]-uridines and -thymidines 4a-12a and 4b-12b have been synthesized and tested against Herpes Simplex virus type 2 (HSV-2) and as cytostatics. Condensation of 2′,3′-O-isopropylidene-5′-O-sulfamoyluridine and 3′-O-acetyl-5′-O-sulfamoylthymidine with the N-hydroxysuccinimide esters of Boc-L-Ser(Bzl), (2R, 3S)-3-benzyloxycarbonylamino-2-hydroxy-4-phenylbuta-noic acid [(2R, 3S-N-Z-AHPBA], (2R, 3S) and (2S, 3R)-N-Boc-AHPBA gave 4a,b-7a,b, which after removal of the protecting groups provided 1Oa,b-12a,b. A study of the selective removal of the O-Bzl protecting group from the L-Ser derivatives 4a,b, without hydrogenation of the pyrimidine ring, has been carried out. Only the fully protected uridine derivatives 4a-7a did exhibit high anti-HSV-2 activity, and none of the synthesized compounds showed significant cytostatic activity against HeLa cells cultures. 相似文献
8.
Tomokazu Sugawara Toyoaki Ishikura Tokuo Itoh Yoshihisa Mizuno 《Nucleosides, nucleotides & nucleic acids》2013,32(3):239-251
Abstract 9-β-D-Arabinofuranosyldeazaadenines [1-deaza-araA (4a) and 3-deaza-araA (4b)] were prepared from 6-chloro-β-D-ribofuranosyl-1- (6a) and -3-deazapurine (6b), respectively. Synthesis of 2′-deoxy-1-deaza-adenosine (5a) from 1-deazaadenosine (6c) is also described. 相似文献
9.
Abstract Treatment of D-xylose (1) with 0.5% methanolic hydrogen chloride under controlled conditions followed by benzoylation and acetolysis afforded crystalline 1-O-acetyl-2, 3, 5-tri-O-benzoyl-α-D-xylofuranose (4) in good yield. Coupling of 4 with 2, 4-bis-trimethylsilyl derivatives of 5-alkyluracils (methyl, ethyl, propyl and butyl) (5a-5d), 5-fluorouracil (5e) and uracil (5f) in acetonitrile in the presence of stannic chloride gave 1-(2,3,5-tri-O-benzoyl-β-D-xylofuranosyl)-nucleosides (6a-6f). Saponification of 6 with sodium methoxide afforded 1-β-D-xylofuranosyl-5-substituted uracils (7a-7f). Condensation of 4 with free adenine in similar fashion and deblocking gave carcinostatic 9-β-D-xylofuranosyladenine (7g). 相似文献
10.
Abstract The reaction of the 2′,3′-lyxoepoxide (1) with ammonium azide gives two products; namely, the 3′-arabino azide (2a) and in low yield 2′-xylo azide (3a). After debenzoylation and reduction the resulting mixture of amines was resolved by chromatography on a weak cation exchanger, Amberlite IRC-50, and afforded crystalline 1-(3-amino-3-deoxy-β-D-arabinofuranosyl)uracil (2c) and 1-(2-amino-2-deoxy-β-D-xylofuranosyl)uracil (3c) in the ratio of 4:1. 相似文献
11.
James L. Kelley James A. Linn Lilia Beauchamp Peter Collins J. W. T. Selway Karen K. Biron 《Nucleosides, nucleotides & nucleic acids》2013,32(4):475-489
Abstract The synthesis and antiherpetic activity of 9-[[[2-hydroxy-1-(hydroxymethyl)ethyl]thio]methy1]guanine (4) and 1-[[[2-hydroxy-1-(hydroxymethyl)ethyl]thio]methy]cytosine (6), the side-chain thio analogues of ganciclovir (3) and BW A1117U (5), are described. The sidechain synthon 1,3-bis(benzyloxy)-2-[(chloromethyl)thio]propane (11) was prepared in four steps from 1,3-bis(benzyloxy)-2-propanol (7). Alkylation of 2-amino-6-chloro-9H-purine with 11 provided the intermediate 9-substituted-2-amino-6-chloropurine 12, which was conveniently converted to 4 in two steps. Reaction of a fivefold excess of cytosine with 11 provided the desired 1-isomer 14, which was debenzylated to give 6. In contrast with ganciclovir (3) and BW A1117U (5), neither 4 nor 6 had significant in vitro activity against human cytomegalovirus. 相似文献
12.
Kandasamy Ramasamy Roland K. Robins Ganapathi R. Revankar 《Nucleosides, nucleotides & nucleic acids》2013,32(3):385-392
Abstract A synthesis of 2,4-dideazaribavirin ( 2 ), brunfelsamidine ribonucleoside ( 8c ) and certain related derivatives are described for the first time using the stereospecific sodium salt glycosylation procedure. Glycosylation of the sodium salt of pyrrole-3-carbonitrile ( 4 ) with 1-chloro-2, 3-O-t-isopropylidene-5-O-t-butyldimethylsilyl-α-D-ribofuranose ( 5 ) gave exclusively the corresponding blocked nucleoside ( 6 ) with β-anomeric configuration, which on deprotection provided 1-β-D-ribofuranosylpyrrole-3-carbonitrile ( 7 ). Functional group tranformation of 7 gave 2 , 8c and related 3-substituted pyrrole ribonucleosides. These compounds are devoid of any significant antiviral/antitumor activity invitro. 相似文献
13.
J. Fuentes Mota J. I. Fernández García-Hierro P. Areces Bravo F. Rebolledo Vicente J. A. Galbis Pérez 《Nucleosides, nucleotides & nucleic acids》2013,32(4):457-477
Abstract 1-Methyl- and 1-aryl-(1,2-dideoxy-D-glyofurano)[2,1-d]-imidazolidine-2-thiones having the configurations β-D-glycero-L-gluco (4), β-D-glycero-D-ido (5—8), α-D glycerol-D-galacto (9—10) and β-D-glycero-D-talo (11, 12) are prepared by reaction of 2-amino-2-deoxy-aldoses with methyl and aryl isothiocyanates. 1-Aryl-(1,2-dideoxy–β-D-glycero-L-gluco-heptofurano)[2,1-d]imidazolidine-2-thiones (1—3) have been converted into 1-aryl-4-(D-galacto-pentitol-1-yl)-4-imidazo-line-2-thiones (24—26) by acid catalysed isomerization. 相似文献
14.
Jun-ichi Asakura 《Nucleosides, nucleotides & nucleic acids》2013,32(7):701-711
Abstract Treatment of poly-acetyl or -benzoyl protected ribonucleosides (1a-i) and 2′-deoxyribonucleosides (3a-d) with metal carbonates such as NaHCO3 or Na2CO3 in MeOH gave the corresponding deacylated free ribomucleosides (2a-d and 4a-b) in excellent high yields. 相似文献
15.
Abstract Phase-transfer catalysis of pyrrolo[2,3-d]pyrimidine 4a with the halogenose 5 yields the anomers 6a and 7a. Deprotection with boron trichloride gives the chloro nucleosides 6b and 7b, which are converted into the potential anticytokinin 2 and its α-anomer 3. 相似文献
16.
Mohammed A. E. Sallam 《Nucleosides, nucleotides & nucleic acids》2013,32(3):297-313
Abstract The C-nucleoside analogs 6,7-dimethyl-3-β-D-erythrofuranosyl-1-phenylpyrazolo[3,4-b]quinoxaline 4 and 3-β- D -erythrofuranosyl-1-p-fluorophenylpyrazolo[3,4-b]quinoxaline 8 were prepared by dehydration of the polyhydroxyalkyl chain of 6,7-dimethyl-1-phenyl-3-( D -arabino-tetritol-1-yl)-pyrazolo[3,4-b]quinoxaline 3 and 1-p-fluorophenyl-3-( D -arabino-tetritol-1-yl)-pyrazolo[3,4-b]quinoxaline 7, respectively. The structure and anomeric configuration of the products were determined by n.m.r. spectroscopy. The mass spectra and biological activities in connection with chemical constitution are discussed. 相似文献
17.
M. Bueno Martínez E. Román Galán J. A. Galbis Pérez 《Nucleosides, nucleotides & nucleic acids》2013,32(2):227-244
Abstract Fusion of 2-trimethylsilylpyridine and tetra-O-acetyl-aldehydo-D-xylose or 2,3:4,5-di-O-isopropylidene-aldehydo-L-arabinose led, after removing of the protecting groups, to 2-(pentitol-1-yl)pyridines of D-gulo and D-ido or L-manno configurations. Dehydration of the sugar-chain with D-gulo and D-ido configurations gave the corresponding 2′,5′-anhydro derivatives, whereas 2-(5-O-isopropyl-L-manno-pentitol-1-yl)-pyridine was the only compound formed by dehydration of the sugar-chain with L-manno configuration. Structural proofs are based on 1H and 13C NMR spectra. 相似文献
18.
Abstract An improved method for the synthesis of 5-aminocytidine (3a), 5-amino-2′-deoxycytidine (3b), and their 5′-monophosphates (3c,d) from the corresponding 5-bromo pyrimidines, using liquid ammonia, is described. The respective 6-aminocytosine derivatives (4a,b,c,d), minor products of the amination reaction, were isolated and characterized. A plausible mechanism is proposed to account for the formation of both 5-and 6-substituted products. 相似文献
19.
Abstract The facile synthesis of several substituted carbohydrates that are amenable for the preparation of 2′,3′-dideoxy-3′-hydroxymethyl nucleosides are reported. Elaboration of a previously reported analog, 5-O-benzoyl-3-deoxy-3-(benzyloxy)methyl-1,2-O-isopropylidene-β-D- ribofuranose (4) has provided two 2,3-dideoxy-3-branched ribose derivatives 5-O-benzoyl-2,3-dideoxy-3-(benzyloxy)methyl-1-O-methyl-β-D-ribofuranose (7) and 1.5-di-O-benzoyl-2,3-dideoxy-3-(benzyloxy)methyl-(α,β)-D-ribofuranose (10). Due to problems involved with the separation of anomeric mixtures when these carbohydrates were condensed with an heterocycle, another versatile synthon 5-O-benzoyl-3-deoxy-3-(benzyloxy)methyl-2-O-t-butyldimethylslyl-1-O- methyl-β-D-ribofuranose (12) was synthesized. The utility of this compound (12) is demonstrated in the total synthesis of 1-[3-deoxy-3-hydroxymethyl-β-D-ribofuranosyl]thymine (20). 相似文献
20.
J. Fuentes Mota P. Areces Bravo F. Rebolledo Vicente J. I. Fernández García-Hierro J. A. Galbis Pérez 《Nucleosides, nucleotides & nucleic acids》2013,32(2):115-121
Abstract Acid catalyzed isomerization of 1-aryl-(1,2-dideoxy-D-glycero-β-L-gluco-heptofuranose) [1,2-d]-2-imidazolines (4) yields 1-aryl-4-(D-galacto-pentitol-1-yl)imidazoles (8) which can be also obtained by reductive desulphuration of 1-aryl-2-benzylthio-4-(D-galacto-pentitol-1-yl)imidazoles (6). Compounds (4) were obtained by desulphuration with Raney nickel from 1-aryl-(1,2-dideoxy-D-glycero-β-L-gluco-heptofuranose) [1,2-d]-imidazolidine-2-thiones (1) or 1-aryl-2-benzylthio-(1,2-dideoxy-D-glycero-β-L-gluco-heptofuranose) [1,2-d]-2-imidazolines (2). 相似文献