Stereocontrolled synthesis of phosphonate derivatives of tetrahydro- and dihydro-2H-pyranyl nucleosides: The selectivity of the Ferrier rearrangement
作者:María-Jesús Pérez-Pérez、Bogdan Doboszewski、Jef Rozenski、Piet Herdewijn
DOI:10.1016/0957-4166(95)00108-2
日期:1995.4
Phosphonate derivatives of 2,5-cis substituted tetrahydro- and dihydro-2H-pyranyl nucleosides have been synthesized following a stereocontrolled approach. The key step in the synthetic pathway is the introduction of the phosphonomethoxy moiety on pentopyranosyl glycals through a Ferrier-type rearrangement, yielding the 1,4-trans phosphonomethyl glycosides as the major isomers. The heterocyclic base has then been incorporated following a Mitsunobu-type condensation reaction, to obtain the 2,5-cis-dihydro-2H-pyranyl nucleosides. The tetrahydropyranyl analogues have been prepared through hydrogenation of 2,5-cis-dihydro-2H-pyranyl nucleosides.