Intramolecular Glycosylation to Form 4-Methoxy-2,6-Dioxopyrimidine Nucleosides via O6,5′-Cyclonucleosides
摘要:
Lewis-acid promoted intramolecular N1 glycosylation to form the novel O-6,5'-cyclonucleoside 1a occurs in high yield from the corresponding acyclic thiophenyl-glycoside 12. The relative stability of the O-6,5' tether compared with O-2,5' and O-2,3' tethers is reported. Cleavage of the anhydro bond was effected with aqueous base to yield the 4-methoxybarbituric acid nucleoside analogue 14.
Intramolecular Glycosylation to Form 4-Methoxy-2,6-Dioxopyrimidine Nucleosides via O6,5′-Cyclonucleosides
摘要:
Lewis-acid promoted intramolecular N1 glycosylation to form the novel O-6,5'-cyclonucleoside 1a occurs in high yield from the corresponding acyclic thiophenyl-glycoside 12. The relative stability of the O-6,5' tether compared with O-2,5' and O-2,3' tethers is reported. Cleavage of the anhydro bond was effected with aqueous base to yield the 4-methoxybarbituric acid nucleoside analogue 14.