Thiosugars. X. Novel Nucleoside Analogues Derived from 4-Thio-L-lyxofuranose
摘要:
1-O-Acetyl-2,3,5-tri-O-benzyl-4-thio-L-lyxofuranose 1 was transformed into O-benzyl- and O-acetyl-protected 1-(4-thio-L-lyxofuranosyl) nucleoside derivatives by use of the TMSOTf method. Debenzylation with boron tribromide or deacetylation with sodium methoxide yielded the corresponding pyrimidine (7-11, 17, 18, 26 and 27) and purine (29 and 34) nucleoside analogues. The anomeric configurations were determined by NMR spectroscopy and, in the case of the 5-halo- (7-9) and nitrouridine derivative 11 and the 6-methylcytidine derivative 27, by X-ray structural analyses. - The unprotected nucleosides were not antivirically inhibitory at 250 muM.
Stereospecific Synthesis of 2-Deoxy-2,2-difluororibonolactone and Its Use in the Preparation of 2′-Deoxy-2′,2′-difluoro-β-D-ribofuranosyl Pyrimidine Nucleosides: The Key Role of Selective Crystallization
作者:T. S. Chou、P. C. Heath、L. E. Patterson、L. M. Poteet、R. E. Lakin、A. H. Hunt
DOI:10.1055/s-1992-26167
日期:——
A stereospecific synthesis of 2′-deoxy-2′,2′-difluorocytidine (gemcitabine), a potential anticancer agent, is described. The stereoselectivity was accomplished via two diastereoselective crystallizations, i. e. the crystallization of the key intermediate, difluororibonolactone 2a, and the crystallization of the hydrochloride salt of gemcitabine 16b from the anomeric mixture. Because of the availability of 2a in large quantities, other 2′-deoxy-2′,2′-difluoropyrimidine nucleosides such as 2′-deoxy-2′,2′-difluorouridine (19) were synthesized for structure-activity relationship studies.
Synthetic approaches to novel cis and trans dideoxynucleosides of the apiose family
作者:Todd B. Sells、Vasu Nair
DOI:10.1016/s0040-4020(01)80740-7
日期:1994.4
Stereoselective synthesis of the complete family of optically active dideoxygenated nucleosides of the apiose family have been developed. The chiral aldodiol system 7, a key intermediate in this synthesis, was prepared from the prochiral molecule 6, through the action of the lipase from Candida cylindracia. Approaches to novel enantiomeric and diastereoisomeric dideoxynucleosides containing the te
This invention relates to a process of stereoselectively synthesizing β-nucleoside, e.g., 2′-deoxy-2,2′-difluorocytidine.
这项发明涉及一种立体选择性合成β-核苷的过程,例如2'-脱氧-2,2'-二氟胞嘧啶。
Inactivation of <i>Lactobacillus leichmannii</i> Ribonucleotide Reductase by 2′,2′-Difluoro-2′-deoxycytidine 5′-Triphosphate: Covalent Modification
作者:Gregory J. S. Lohman、JoAnne Stubbe
DOI:10.1021/bi902132u
日期:2010.2.23
nucleoside triphosphates to deoxynucleotides and is rapidly (<30 s) inactivated by 1 equiv of 2′,2′-difluoro-2′-deoxycytidine 5′-triphosphate (F2CTP). [1′-3H]- and [5-3H]F2CTP were synthesized and used independently to inactivate RNR. Sephadex G-50 chromatography of the inactivation mixture revealed that 0.47 equiv of a sugar was covalently bound to RNR and that 0.71 equiv of cytosine was released. Alternatively