作者:Zicheng Li、Shuhua Chen、Ning Jiang、Gang Cui
DOI:10.1081/ncn-120022032
日期:2003.7.1
of 2-acetoxyisobutyryl chloride and NaBr was employed in the synthesis of 22 and 23. Treatment of 19 with an activated Zn/Cu couple and deprotection gave 2′,3′-anhydro nucleoside (21), and treatment of 22 and 23 with an activated Zn/Cu couple and a little of HOAc and deprotection gave corresponding 2′,3′-unsaturated triazole nucleosides (24 and 25), respectively. The biological activity of the compounds
摘要 5'-O-Mesyl-2',3'-O-异亚丙基核糖核苷(4 和 12)通过与 NaN3 或 KI 反应以良好的产率转化为其 5'-取代的核苷。2',3'-O-异亚丙基核糖核苷(3 和 11)是从核糖核苷 1 和 2 用丙酮和原甲酸三乙酯的反应混合物而不是使用丙酮二乙缩醛以良好的产率制备的。化合物 1 或 2 用 2-乙酰氧基异丁酰卤(Cl 或 Br)处理,得到 1-[2-O-acetyl-3-halo-3-deoxy-5-O-(2,5,5-trimethyl-1, 3-dioxolan-4-on-2-yl)-β-D-xylofuranosyl]-1,2,4-triazole-3-carboxamide (19, 22, and 23) 高产率。22 和 23 的合成中不使用 2-乙酰氧基异丁酰溴,而是使用 2-乙酰氧基异丁酰氯和 NaBr 的混合物。用活化的 Zn/Cu 对处理 19