Synthesis of 5-carbon-substituted 1-beta-D-ribofuranosylimidazole-4-carboxamides are described. Treatment of 5-iodo derivative 8 with methyl acrylate in the presence of palladium catalyst gave (E)-5-(2-carbomethoxyvinyl)-1-(2,3,5-tri-O-acetyl- beta-D-ribofuranosyl)imidazole-4-carboxamide (9), followed by appropriate manipulations to afford various 5-carbon-substituted imidazole derivatives 1-7. The antileukemic activities of these imidazole nucleosides are also described.
SUZUKI, MASAHIRO;TANAKA, HIROMICHI;MIYASAKA, TADASHI, CHEM. AND PHARM. BULL., 35,(1987) N 10, 4056-4063
Several 5-carbon-substituted 1-β-D-ribofuranosylimidazole-4-carboxamides were synthesized via the direct C-5 lithiation of a protected 4-carboxamide derivative as the key reaction step. Wittig reaction of a 5-formyl derivative was also examined.