A mild two-step one-pot procedure for the conversion of ortho-nitroamino aromatic heterocycles into corresponding benzo and heteroaromatic fused imidazoles is described. The procedure utilizes iron powder, acetic acid, triethylorthoformate, and a catalytic amount of Ytterbium triflate at 75 °C for the nitro group reduction and cyclization reaction. The optimum stoichiometry of each component is highlighted
Synthesis and antiviral evaluation of nucleosides of 5-methylimidazole-4-carboxamide
作者:Rosario Alonso、J. Ignacio Andres、M. Teresa Garcia-Lopez、Federico G. De las Heras、Rosario Herranz、Balbino Alarcon、Luis Carrasco
DOI:10.1021/jm00383a027
日期:1985.6
)-carboxamide with 3,5-di-O-p-toluoyl-2-deoxy-D-erythro-pentofuranosyl chloride via mercuric cyanide method provided an anomeric mixture of the blocked 5-methylimidazole-4-carboxamide deoxynucleoside 14 along with an anomeric mixture of the 4-methyl 5-carboxamide isomer 15. Separation of compound 14 into the corresponding beta and alpha anomers was achieved by conversion to the 3',5'-di-O-acetyl derivatives
Synthesis of ribonucleosides of 4(5)-cyano-5(4)-methylimidazole and related 4-substituted-5-methylimidazole ribosides
作者:J. Ignacio Andrés、M. Teresa García-Lopez
DOI:10.1002/jhet.5570230308
日期:1986.5
methanolic ammonia, ammonium chloride in liquid ammonia and potassium hydrosulfide provided 4-cyano-1-β-D-ribofuranosyl-5-methylimidazole (6), 1-β-D-ribofuranosyl-5-methylimidazole-4-carboxamide (2) and 1-β-D-ribofuranosyl-5-methylimidazole-4-thiocarboxamide (11) respectively. Reaction of 6 with hydroxylamine afforded the corresponding 4-carboxamidoxime substituted nucleoside (13) which on catalytic reduction