Regioselective Mitsunobu Reaction of Partially Protected Uridine
作者:Maurycy Szlenkier、Karol Kamel、Jerzy Boryski
DOI:10.1080/15257770.2016.1188943
日期:2016.8.2
Mitsunobu reaction of partially acylated uridine proceeds with high regioselectivity for intramolecular SN2 anhydro linkage closuring. Under the reaction conditions, an isomeric mixture of diacyl uridine derivatives with either free 2′- or 3′-hydroxyl group was transformed into a single cyclonucleosidic product, 2,2′-anhydro-3′,5′-di-O-acyluridine. This paper presents a possible mechanism of the reactions
The present application provides compounds of Formula (B), or pharmaceutically acceptable salts thereof, wherein D is a residue of a biologically active drug, which underdo hydrolysis under physiological conditions to release the biologically active drug and which are useful in the treatment of disorders that could be beneficially treated with the drug.
Kilogram-Scale Synthesis of 2′-<i>C</i>-Methyl-<i>arabino</i>-Uridine from Uridine via Dynamic Selective Dipivaloylation
作者:John Y. L. Chung、Amude M. Kassim、Bryon Simmons、Tyler A. Davis、Zhiguo J. Song、John Limanto、Stephen M. Dalby、Cyndi Q. He、Ralph Calabria、Timothy J. Wright、Louis-Charles Campeau
DOI:10.1021/acs.oprd.1c00175
日期:2022.3.18
the kilogram-scale preparation of 2′-C-methyl-arabino-uridine, a keyintermediate in the synthesis of the HCV NS5B inhibitor uprifosbuvir. Starting from uridine, dipivaloylation afforded an ∼2:1 mixture of 3′,5′- and 2′,5′-dipivaloyluridine. Subjecting this mixture to TEMPO/bleach oxidation promoted a dynamic acylation migration–selective oxidation to afford the 2′-ketone in 65% yield. Alternatively