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The structural formulas of the 2'-deoxy-2/-fluoro-l',2'-seco-nucleosides/nucleotides depicted in this paper are drawn in the “arabinose-like” conformation to point out their similarity with certain 2'-fluoroarabinosylpyrimidine nucleosides, e.g.
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The structural formulas of the 2'-deoxy-2/-fluoro-l',2'-seco-nucleosides/nucleotides depicted in this paper are drawn in the “arabinose-like” conformation to point out their similarity with certain 2'-fluoroarabinosylpyrimidine nucleosides, e.g., FIAU and FMAU, that have demonstrated significant antiviral activity. In the text the naming and numbering of these analogues follow nucleoside nomenclature, however; in the Experimental Section the acyclic side chains of the 1',2'-seco-nucleosides/nucleotides are named and numbered in accordance with butanetriol nomenclature.
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FIAU and FMAU, that have demonstrated significant antiviral activity. In the text the naming and numbering of these analogues follow nucleoside nomenclature, however; in the Experimental Section the acyclic side chains of the 1',2'-seco-nucleosides/nucleotides are named and numbered in accordance with butanetriol nomenclature
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Opening of the epoxide was investigated with a variety of conditions and solvents at reflux, i.e., using potassium fluoride and 18-crown-6 in acetonitrile
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the same reagents in benzene (Liotta, C. L.; Harris, H. P. J. Am. Chem. Soc. 1974, 96, 2250), potassium fluoride and tetrabutylammonium chloride in benzene (Carpino, L. A.; Sau, A. C. J. Chem. Soc., Chem. Commun. 1979, 514), and potassium hydrogen fluoride in 1,2-ethanediol (Barford, A. D.; Foster, A. B.; Westwood, J. H.; Hall, L. D.; Johnson, R. N. Carbohydr. Res. 1971, 19, 49) as well as tert-butyl alcohol (Sarel-Imber, M.; Bergmann, E. D. Carbohydr. Res. 1973, 27, 73). All of these methods failed to yield 2. The opening of 1 with TBAF gives on average a 65% yield of 2
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Opening of the epoxide was investigated with a variety of conditions and solvents at reflux, i.e., using potassium fluoride and 18-crown-6 in acetonitrile (Mengel, R.; Guschlbauer, W. Angew. Chem., Int. Ed. Engl. 1978, 17, 525), the same reagents in benzene (Liotta, C. L.; Harris, H. P. J. Am. Chem. Soc. 1974, 96, 2250), potassium fluoride and tetrabutylammonium chloride in benzene (Carpino, L. A.; Sau, A. C. J. Chem. Soc., Chem. Commun. 1979, 514), and potassium hydrogen fluoride in 1,2-ethanediol (Barford, A. D.; Foster, A. B.; Westwood, J. H.; Hall, L. D.; Johnson, R. N. Carbohydr. Res. 1971, 19, 49) as well as tert-butyl alcohol (Sarel-Imber, M.; Bergmann, E. D. Carbohydr. Res. 1973, 27, 73). All of these methods failed to yield 2. The opening of 1 with TBAF gives on average a 65% yield of 2.
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