Synthesis and cytotoxic activity of C-glycosidic nicotinamide riboside analogs
摘要:
The C-glycosidic nicotinamide riboside analogue (2) was prepared by reaction of ribonolactone 24 with the lithiated oxazoline 19 followed by triethylsilane reduction to 26 and deprotection. Selective phosphorylation to the pseudonucleotide 34 was effected via the isopropylidene compound 33. In contrast to the benzoic acid riboside (28) the benzamide riboside (2) showed extremely high cytotoxicity at nanomolar concentrations to S49.1 lymphoma cells but only slightly increased dexamethasone toxicity.
Synthesis and cytotoxic activity of C-glycosidic nicotinamide riboside analogs
作者:Karsten Krohn、Heidi Heins、Klaus Wielckens
DOI:10.1021/jm00081a012
日期:1992.2
The C-glycosidic nicotinamide riboside analogue (2) was prepared by reaction of ribonolactone 24 with the lithiated oxazoline 19 followed by triethylsilane reduction to 26 and deprotection. Selective phosphorylation to the pseudonucleotide 34 was effected via the isopropylidene compound 33. In contrast to the benzoic acid riboside (28) the benzamide riboside (2) showed extremely high cytotoxicity at nanomolar concentrations to S49.1 lymphoma cells but only slightly increased dexamethasone toxicity.
Manganese-catalyzed deoxygenation of secondary and tertiary amides under mild conditions
作者:Jiamin Huang、Feixiang Sun、Weiping Liu
DOI:10.1016/j.jcat.2023.04.012
日期:2023.7
operationally simple transformation proceeds under mild conditions without external ligands and features high catalytic efficacy and good functional-group tolerance. Furthermore, the generality of this developed catalytic system was further demonstrated by the late-stagemodification of bioactive molecules.