An improved synthesis of α-AZA, α-AZP and α-AZG, the precursors to clinical markers of tissue hypoxia
摘要:
alpha-[I-123]-IAZA and alpha-[I-123]-IAZP are experimental diagnostic radiopharmaceuticals which have been used clinically to diagnose hypoxia in a number of pathologies, including cancer, peripheral vascular disease, rheumatoid arthritis and brain trauma. These nitroimidazole nucleosides are synthesized from the non-iodinated nucleosides AZA, AZP and AZG, respectively. Earlier methods report low chemical yields for the synthesis of these precursors. The modified procedures now reported provide nearly quantitative yields of these compounds, thereby substantially reducing the cost and effort of synthesis. (C) 2001 Elsevier Science Ltd. All rights reserved.
New azomycin acyclonucleoside. Synthesis and biodistribution of radiohalogenated analogues in tumor-bearing mice
作者:Ahmad Hasan、Furn F. Knapp、Michael R. Kilbourn、Donald J. Buchsbaum
DOI:10.1002/jhet.5570300528
日期:1993.10
The design, synthesis and biological activities of several acyclonucleoside analogues related to misoni-dazole are described. The hydroxy-5, bromo-6, iodo-7, and fluoro-8 derivatives of ethoxymethylazomycin and iodopropenyloxymethylazomycin (12) have been prepared. Alkylation of silylated azomycin with haloethoxy-methylene chloride gave the corresponding acyclonucleosides. Similarly, propargyloxymethylene
Potential radiosensitizing agents. 6. 2-Nitroimidazole nucleosides: arabinofuranosyl and hexopyranosyl analogs
作者:Masakazu Sakaguchi、Cynthia A. Larroquette、Krishna C. Agrawal
DOI:10.1021/jm00355a005
日期:1983.1
New 2-nitroimidazole nucleosides have been synthesized as radiosensitizers of hypoxic mammalian cells in an attempt to reduce the neurotoxicity and to increase the therapeutic efficacy of this class of agents. The trimethylsilyl derivative of 2-nitroimidazole was condensed with 1-bromo-2,3,5-tri-O-benzoylarabinofuranose in the presence of mercuric cyanide to yield anomeric isomers of arabinofuranosides, which were separated by preparative thin-layer chromatography. Reaction of 2-deoxy-1,3,4,6-tetra-O-acetyl-D-glucose or 3,4,6-tri-O-acetyl-D-glucal with 2-nitroimidazole in the presence of an acid catalyst produced alpha and beta isomers of 2',3'-dideoxy-D-erythro-hex-2'-enopyranosides and an isomeric 3-substituted 1,2,3-trideoxy-D-erythro-hex-1-enopyranose. Hydrolysis of the esters was accomplished with sodium methoxide in methanol at 0 degrees C. The radiosensitizing efficacy of these agents was determined against Chinese hamster (V-79) cells in vitro. The 1-(2',3'-dideoxy-alpha-D-erythro-hex-2'-enopyranosyl)-2-nitroimidazole was the most active agent of this series and was found to be superior to misonidazole as a radiosensitizer.
SRIVASTAVA, PREM C.;HASAN, AHMAD, NUCLEOSIDES AND NUCLEOTIDES, 9,(1990) N, C. 899-905