The Selective Protection of Uridine with a p-Methoxybenzyl Chloride: A Synthesis of 2′-O-Methyluridine

Abstract
2′-O-Methyluridine was prepared through 5 steps from uridine by use of p-methoxybenzyl group (PMB) as an N3-protecting group of uridine. A chemoselective protection method has been developed by use of DBU as a base and deprotection was effected by AlCl3–anisole system.