Stereospecific deuteration of α-furanosyl azomycin nucleosides: A model reaction for tritium radiolabeling
作者:Piyush Kumar、Saeed Emami、Alexander J.B. McEwan、Leonard I. Wiebe
DOI:10.1016/j.bmcl.2008.04.055
日期:2008.6
Stereospecific synthesis of 1-alpha-D-(2-deuteroribofuranosyl)-2-nitroimidazole (2'-[H-2]-alpha-AZR) is reported. This, deuteration was independent of the con. guration of C-2' -OH group (arabinose or ribose) in sugar moiety of starting molecules. Slightly better yield (>37%) of the deuterated product, 6, from arabinosyl precursor in comparison to corresponding ribose precursor (29%) was obtained which may reflect better stereochemical availability of C-2' -OH in arabinose during oxidation. Crown copyright (C) 2008 Published by Elsevier Ltd. All rights reserved.
Preparation of Nucleosides Derived from 2-Nitroimidazole and <scp>d</scp>-Arabinose, <scp>d</scp>-Ribose, and <scp>d</scp>-Galactose by the Vorbrüggen Method and Their Conversion to Potential Precursors for Tracers To Image Hypoxia
作者:Anna Schweifer、Friedrich Hammerschmidt
DOI:10.1021/jo200727k
日期:2011.10.21
acetylated at the other ones in a one-pot reaction, mixtures of anomeric 1-O-acetyl derivatives were obtained. These were coupled by the Vorbrüggen method and then deblocked at C-5 and tosylated to give precursors for tracers to image hypoxia in four steps without using Hg(CN)2 necessary for other methods. The Vorbrüggen conditions enable a shorter route to azomycin nucleoside analogues than the previous coupling