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Spin labeled nucleoside analogues : 4'-hydroxymorpholin-2'-ylpurines and pyrimidines

Tronchet, Jean M.J.
Zsély, Martina
Cabrini, Daniel
Jorand, Chantal
Barbalat-Rey, Françoise
Ricca, Alessandra
Published in Nucleosides & Nucleotides. 1993, vol. 12, no. 6, p. 615-629
Abstract Upon borane-pyridine reduction, a series of nucleoside dialdehyde dioximes 2 underwent cyclization to the corresponding 4'-hydroxymorpholin-2'-ylpurines or pyrimidines 3 from which the peracetyl derivatives 4 were prepared. At room temperature, compounds 3 and 4 exist as a mixture of invertomers in which the 4'S (equatorial 4'-OH or 4'-OAc) predominates. A 14 kcal/mol, nitrogen inversion barrier was estimated from variable temperature experiments. N.O.E. and 3JCH measurements established the anti conformation of the base-"sugar" bond. Compounds 3 spontaneously oxidized to the corresponding aminoxyl free radicals, EPR spectra of which showed that they existed in a chair conformation.
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Research groups Groupe Geoffroy
Groupe Weber
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TRONCHET, Jean M.J. et al. Spin labeled nucleoside analogues : 4'-hydroxymorpholin-2'-ylpurines and pyrimidines. In: Nucleosides & Nucleotides, 1993, vol. 12, n° 6, p. 615-629. https://archive-ouverte.unige.ch/unige:2890

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Deposited on : 2009-09-21

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