A new and efficient route to the synthesis of pyrazole and pyrimidine C-nucleoside derivatives
作者:Augusto C Veronese、Carlo F Morelli
DOI:10.1016/s0040-4039(98)00631-5
日期:1998.5
A new route to the synthesis of pyrazole and pyrimidine C-nucleosides, involving as the key step a metal catalysed reaction of β-D-ribofuranosyl ketoesters with alkyl cyanoformates, is described, 2,3,5-Tri-O-benzoyl-β-D-ribofuranosyl cyanide (1) reacts with α-bromoesters, in the presence of zinc dust, to give β-D-ribofuranosyl-enaminoesters 2 which are easily hydrolised to β-ketoesters 3. The reactions
描述了一种合成吡唑和嘧啶C-核苷的新途径,其中涉及作为关键步骤的β-D-呋喃呋喃糖基酮酸酯与烷基氰甲酸酯的金属催化反应,即2,3,5-Tri-O-苯甲酰基-β -D呋喃核糖基氰化物(1)反应用α-溴酯,在锌粉的存在下,以得到β-d呋喃核糖基enaminoesters 2这很容易hydrolised到β酮酯3。在催化量的[Cu(acac)2 ]存在下,化合物3与烷基氰基甲酸酯的反应,得到C-糖基烯氨基酮4。这些化合物与苄肼和乙am反应,生成吡唑和嘧啶C-核苷5和6 分别。