Fluorination Reactions at C-5 of 3-<i>O</i>-Benzyl-6-deoxy-1,2-<i>O</i>-isopropylidenehexofuranoses
作者:Yoko Mori、Naohiko Morishima
DOI:10.1246/bcsj.67.236
日期:1994.1
α-D-allo-, and β-L-talo-furanoses (1, 2, 3, and 4) were investigated. The reaction of 1 with diethylaminosulfur trifluoride (DAST) predominantly produced 2-O-benzyl-5,6-dideoxy-5-fluoro-1,2-O-isopropylidene-α-D-glucofuranose with the retention of the configuration at C-5. Both of the fluorides with retained and inverted configurations were obtained in the fluorination of 2 with DAST. In contrast, only the
2-O-benzyl-6-deoxy-1,2-O-isopropylidene-α-D-gluco-, β-L-ido-, α-D-allo-, and β-L-talo-furanoses 的氟化反应(1, 2, 3, 和 4) 进行了研究。1 与二乙氨基三氟化硫 (DAST) 的反应主要产生 2-O-benzyl-5,6-dideoxy-5-fluoro-1,2-O-isopropylidene-α-D-glucofuranose,其构型保留在 C- 5. 在用 DAST 对 2 进行氟化时,获得了具有保留构型和倒置构型的两种氟化物。相比之下,当 3 和 4 与 DAST 反应时,仅发生构型反转。3 和 4 的甲磺酸盐与四丁基氟化铵 (TBAF) 以及它们的三氟甲磺酸盐与三(二甲氨基)锍二氟三甲基硅酸盐(TASF)的反应得到 5-脱氧-5-氟衍生物,每个构型和 5, 6-不饱和衍生物。然而,1