H. Wamhoff et al., NEW ACCESS TO 7-MEMBERED HETEROCYCLIC C-GLYCOSIDES BY THE CYCLO-ADDITION-RING-EXPANSION (CARE)-REACTION, Synlett, (11), 1998, pp. 1193
CARE-reaction of methyl ylidene-5-O-trityl-beta-D-ribofuranosyl)propio
late 1 and methyl 4(R)-4,5-O-isopropylidene-2-pentynecarboxylate 10 le
ading to 7-membered heterocyclic C-glycosides is reported.