Convenient Synthesis of Nucleosides of 2-Deoxy-2-nitro-D-galactose andN-Acetyl-D-galactosamine
作者:Gottfried A. Winterfeld、Jagattaran Das、Richard R. Schmidt
DOI:10.1002/1099-0690(200009)2000:17<3047::aid-ejoc3047>3.0.co;2-6
日期:2000.9
A new method for the construction of nucleosides of 2-deoxy-2-nitro-D-galactose and of N-acetyl-D-galactosamine based on addition reactions to 3,4,6-tri-O-benzyl-2-nitro-D-galactal (1) is presented. The reaction of imidazole, benzimidazole, purine, N6-benzyladenine, indazole, benzotriazole, and pyridone with 1 under base activation afforded the corresponding β-glycosides with a high degree of stereo-
基于 3,4,6-tri-O-benzyl-2-nitro-的加成反应构建 2-脱氧-2-硝基-D-半乳糖和 N-乙酰-D-半乳糖胺核苷的新方法提出了 D-半乳醛 (1)。咪唑、苯并咪唑、嘌呤、N6-苄基腺嘌呤、吲唑、苯并三唑和吡啶酮在碱活化下与 1 反应得到具有高度立体选择性和区域选择性的相应 β-糖苷。2-脱氧-2-硝基-核苷 3 和 4 的还原在 N-乙酰化后得到相应的 2-乙酰氨基-2-脱氧-核苷 9 和 10。在 Pd 存在下用 H2 实现 9 的完全脱保护(OH)2/C和THF作为溶剂。