4-Amino-3-(2,3,5-tri-O-benzyl-beta-D-ribofuranosyl)-5-pyrazole-carb oni trile. Synthesis and conversion into a sugar-blocked 5,7-disubstituted formycin analog.


The title compound, a potential intermediate to protected C-nucleoside analogs related to formycin A, was synthesized via a new route wherein 2,3,5-tri-O-benzyl-1-O-p-nitrophenyl)-D-ribofuranose was converted to 2,5-anhydro-3,4,6-tri-O-benzyl-D-allonic acid, and further transformed into 4-(tert-butyloxycarbonyl)-5-ethoxycarbonyl-3-(2,3,5-tri-O-benzyl-beta-D… (More)


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