Stereocontrolled synthesis of (5+5), (5+6) and (6+6) 3-spiropseudonucleosides
作者:Consolación Gasch、José M. Illangua、Penélope Merino-Montiel、José Fuentes
DOI:10.1016/j.tet.2009.03.038
日期:2009.5
3-Spiropseudonucleosides, in which the heterocyclic base is a five-membered (oxazolidine, imidazolidine, thiohydantoin) or six-membered (perhydrooxazine) heterocycle, have been prepared starting from a hexofuranos-3-ulose. The method leads to good yields and is completely stereoselective. The key intermediate is a sugar iso(thio)cyanate.
Spiranic d-gluco-configured N-substituted thiohydantoins as potential enzymatic inhibitors
作者:Consolación Gasch、Penélope Merino-Montiel、Óscar López、José G. Fernández-Bolaños、José Fuentes
DOI:10.1016/j.tet.2010.09.109
日期:2010.12
preparation of conformationally-restricted pseudonucleosides bearing a spiranic thiohydantoin scaffold on C-3 of the sugar moiety by coupling partiallyprotected 3-amino-3-methoxycarbonyl and 3-isothiocyanato-3-methoxycarbonyl glucofuranose derivatives with alkyl(aryl)isothiocyanates or with alkyl(aryl)amines; the key step is a spontaneous or thermal-induced intramolecular nucleophilic substitution