The design, synthesis and antileukemic activity of 5-alkynyl-1-.BETA.-D-ribofuranosylimidazole-4-carboxamides.
作者:Akira Matsuda、Noriaki Minakawa、Takuma Sasaki、Tohru Ueda
DOI:10.1248/cpb.36.2730
日期:——
The design, synthesis and antileukemic activity of 5-alkynel-1-β-D-ribofuranosylimidazole-4-carboxamides (6) are described. The cross-coupling reaction of 5-iodo-1-(2, 3, 5-tri-O-acetyl-β-D-ribofuranosyl)imidazole-4-carboxamide (8) with various terminal alkynes in the persence of bis(benzonitrile)palladium dichloride and triethylamine in acetonitrile gave 5-alkylnyl derivatives (9) in high yields. Coupling of 8 with (trimethylsilyl)acetylene gave hte undesired dimer (10). Instead of (trimethylsilyl)acetylene, treatment of trimethyl[(tributyl-satannyl)ethynyl]silane with 8 in the absence of triethylamine produced the desired 5-[2-(trimethylsilyl)ethynyl] derivative (9f) in 77% yield. Deblocking of these nucleosides (9) gave the target nucleosides (6a-f). Among them, 5-ethynyl-1-β-D-ribofuranosylimidazole-4-carboxyamide (6f) is the most potent inhibitor of the growth of murine L1210 cells in vitro (IC50=0.18 μg/ml).
描述了 5-炔基-1-β-D-呋喃核糖基咪唑-4-甲酰胺 (6) 的设计、合成和抗白血病活性。 5-碘-1-(2,3,5-三-O-乙酰基-β-D-呋喃核糖基)咪唑-4-甲酰胺(8)与各种末端炔烃在双(苯甲腈)存在下的交叉偶联反应)二氯化钯和三乙胺在乙腈中以高产率得到5-烷基衍生物(9)。 8与(三甲基甲硅烷基)乙炔偶联得到不需要的二聚体(10)。在不存在三乙胺的情况下,用8代替(三甲基甲硅烷基)乙炔处理三甲基[(三丁基-饱和烷基)乙炔基]硅烷,产生所需的5-[2-(三甲基甲硅烷基)乙炔基]衍生物(9f),收率77%。这些核苷 (9) 的解封闭得到目标核苷 (6a-f)。其中,5-乙炔基-1-β-D-核呋喃基咪唑-4-羧酰胺(6f)是体外小鼠L1210细胞生长最有效的抑制剂(IC50=0.18 μg/ml)。