Nucleic Acid Related Compounds. 80. Synthesis of 5'-S-(Alkyl and aryl)-5'-fluoro-5'-thioadenosines with Xenon Difluoride or (Diethylamido)sulfur Trifluoride, Hydrolysis in Aqueous Buffer, and Inhibition of S-Adenosyl-L-homocysteine hydrolase by derived "Adenosine 5'-Aldehyde" Species
摘要:
Treatment of 5/-S-(alkyl and aryl)-5'-thioadenosine derivatives 2 with XeF2, or the corresponding sulfoxides 3 with DAST/SbCl3, gave diastereomeric 5'-fluoro compounds which were deprotected to give the 5'-S-(alkyl and aryl)-5'-fluoro-5'-thioadenosine analogues 5. Stereochemistry was established by X-ray crystallography, and F-19 NMR chemical shifts were definitive for configurationally-related 5'-fluoro diastereomers. Sulfoxidation and thermolysis afforded the fluoromethylene analogues with retained relative configuration. The nucleoside 5'-alpha-fluoro thioethers 5 underwent spontaneous hydrolysis in aqueous buffer to give derived ''adenosine 5'-aldehyde'' species which caused potent time-dependent inactivation of S-adenosyl-L-homocysteine hydrolase.
Nucleic acid related compounds. 79. Efficient conversions of thioethers to .alpha.-fluoro thioethers with DAST or DAST/antimony(III) chloride
作者:Morris J. Robins、Stanislaw F. Wnuk
DOI:10.1021/jo00067a009
日期:1993.7
Dialkyl or alkyl aryl thioethers, including nucleoside thioethers, undergo virtually quantitative conversion to alpha-fluoro thioethers with (diethylamino)sulfur trifluoride (DAST) in dichloromethane at ambient temperature. Antimony(III) chloride catalyzes the process.
Nucleic Acid Related Compounds. 82. Conversions of Adenosine to Inosine 5′-Thioether Derivatives with<i>Aspergillus oryzae</i>Adenosine Deaminase or Alkyl Nitrites. Substrate and Inhibitory Activities of Inosine 5′-Thioether Derivatives with Purine Nucleoside Phosphorylase
作者:Stanislaw F. Wnuk、Johanna D. Stoeckler、Morris J. Robins
DOI:10.1080/15257779408013249
日期:1994.3
Adenosine derivatives lacking a 5'-hydroxyl group seldom act as alternative substrates of adenosine deaminases from calf intestine and other mammalian sources. A deaminase from Aspergillus oryzae deaminated adenosine 5'-thioether derivatives cleanly and more efficiently than alkyl nitrites. The inosine derivatives were very poor alternative substrates and weak inhibitors of purine nucleoside phosphorylase.