Synthesis of 2′-deoxy-pyranosyl nucleosides from glycals through consecutive addition of phenylselenenyl chloride and glycosylation. A study of factors controlling the stereoselectivity
摘要:
2'-Deoxy-2'-phenylselenenyl-pyranosyl nucleosides have been synthesised in a stereoselective way starting from glycals using selenium reagents, and converted into 2'-deoxynucleosides by treatment with tributyltin hydride. The stereoselectivity of the reaction has been shown to be dependent on the protecting groups, the structure of the starting glycal, the phenylselenenyl reagent and the solvent. Nucleosides of beta-gluco beta-galacto and alpha-arabino configuration are principally obtained, starting from the corresponding benzyl protected glycals, using PhSeCl as an activating reagent and ehter as the solvent.
Synthesis of 2′-deoxy-pyranosyl nucleosides from glycals through consecutive addition of phenylselenenyl chloride and glycosylation. A study of factors controlling the stereoselectivity
摘要:
2'-Deoxy-2'-phenylselenenyl-pyranosyl nucleosides have been synthesised in a stereoselective way starting from glycals using selenium reagents, and converted into 2'-deoxynucleosides by treatment with tributyltin hydride. The stereoselectivity of the reaction has been shown to be dependent on the protecting groups, the structure of the starting glycal, the phenylselenenyl reagent and the solvent. Nucleosides of beta-gluco beta-galacto and alpha-arabino configuration are principally obtained, starting from the corresponding benzyl protected glycals, using PhSeCl as an activating reagent and ehter as the solvent.