2-[[O-(p-Methoxybenzyl)-oxy]methyl]-5,6-dihydro-1,4-dithiin 1 is a versatile three carbon homologation reagent which has been conveniently used in the synthesis of enantiomerically pure modified nucleosides.
Synthesis of 2,3-dihydro-1,4-dithiinyl nucleosides via Pummerer-type glycosidation
A straightforward procedure for the preparation of nucleoside analogue 1 and its regioisomer 2 containing a dihydro-1,4-dithiin as sugar moiety has been accomplished in four steps by our readily available heterocyclic system 5. Nucleobase insertion was carried out by direct addition of N-4-acetylcytosine to sulfoxide derivatives via Pummerer-type glycosidation reaction. (C) 2010 Elsevier Ltd. All rights reserved.
A New and Versatile Allylic Alcohol Anion and Acyl β-Anion Equivalent for Three-Carbon Homologations