Synthesis and biological evaluation of new pyrazole- and tetrazole-related C-nucleosides with modified sugar moieties
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3(5)-Carboxamido-4-(beta-D-ribofuranosyl)pyrazoles bearing 2-benzamido (15) and 3-mesyloxy (29) isosteric groups, as well as the tetrazole C-nucleosides with 2-benzamido-2-deoxy-beta-D-ribofuranose (19) and 3-azido-3-deoxy-beta-D-xylofuranose (36) as sugar segments, have been synthesized starting from D-glucose, by utilizing the 2,5-anhydro-D-glucose ethylene acetal derivatives 1 and 20 as divergent intermediates. The C-nucleosides 15 and 36 were shown to be moderate inhibitors of the in vitro growth of both N2a and BHK 21 tumour cell lines, whereas 29 showed a selective, although not potent cytotoxic activity against N2a cells. Compound 29 also showed a moderate in vitro antiviral activity towards the rabies virus. (C) 2002 Elsevier Science Ltd. All rights reserved.