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Palladium was used for a cross coupling of 2,6-dichloro-3-iodoimidazo[1,2-a]pyridine (2) to 2,3-dihydrofuran (3). Optimization of the coupling conditions have given exclusively (+/-)-2,6-dichloro-3-(2 ,5 -dihydrofuran-2 -yl)imidazo[1,2-a]pyridine (4) in high yield. Compound 4 was dihydroxylated using a catalytic amount of osmium tetroxide to give the erythrofuranosyl C-nucleoside derivatives 6...
A novel ribosylated imidazo[1,2-a]pyridine C-nucleoside was synthesized by condensing a lithiated 2,6-dichloroimidazo[1,2-a]pyridine (1) with a protected ribonolactone (2), followed by acetylation to give the intermediate nucleoside 4. This intermediate was reductively deacetoxylated and deprotected to give what was determined to be the novel and unexpected 2,6-dichloro-5-(β-D-ribofuranosyl)imidazol[1,2-a]pyridine...
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