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
converted to a potential precursor for a fluorine-18 labeled hypoxia tumor marker. Two nonradioactive standards, the 6′-deoxy-6′-fluorogalactosyl and the 4′-deoxy-4′-fluoroglucosyl analogue were also prepared. These 2-nitroimidazole nucleosides were prepared by a modified Vorbrüggen coupling. Acetyl-protected 1-(β-d-galactopyranosyl)-2-nitroimidazole was converted to a potential precursor for a fluorine-18