A Novel, Simple Cyclocondensation
Reaction Towards Glycosyl Triazines

Vincent Kikelj; Karine Julienne; Pascal Janvier; Jean-Claude Meslin; David Deniaud

doi:10.1055/s-0028-1083156

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Synthesis 2008(21): 3453-3460
DOI: 10.1055/s-0028-1083156

PAPER

A Novel, Simple Cyclocondensation Reaction Towards Glycosyl Triazines

Vincent Kikelj^a,b, Karine Julienne^a,b, Pascal Janvier^a,b, Jean-Claude Meslin^a,b, David Deniaud*^a,b
^a CEISAM, Chimie Et Interdisciplinarité, Synthèse, Analyse, Modélisation, UFR des Sciences et des Techniques, Université de Nantes, 2 rue de la Houssinière, BP 92208, 44322 Nantes Cedex 3, France
^b CNRS, UMR CNRS 6230, 2 rue de la Houssinière, BP 92208, 44322 Nantes Cedex 3, France
Fax: +33(2)51125402; e-Mail: david.deniaud@univ-nantes.fr;

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Publication History

Received 11 June 2008
Publication Date:
25 September 2008 (online)

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Abstract

Sugars bearing an isothiocyanate moiety at C-1 react with diazadienium iodide to afford glycosyl triazines that represent, through an easy cyclocondensation reaction step, a flexible entry to different nucleoside analogues. We herein demonstrate that this [4+2] cycloaddition reaction occurs with total regiocontrol and good yields. Subsequent transformation of the thiocarbonyl into a carbonyl, and nucleophilic substitution of the methylsulfanyl group by ammonia, yields the 5-azacytidine analogues. All compounds were fully characterised by IR, HRMS, and ^¹³C and ^¹H NMR (COSY, HMBC and HMQC).

Key words

nucleosides - triazines - cycloaddition - 5-azacytidine - heterochemistry