Generation of 4′-Carbon Radicals via 1,5-Hydrogen Atom Transfer for the Synthesis of Bridged Nucleosides
作者:Yuta Ito、Koichi Mizuno、Sanae Sumise、Airi Kimura、Nozomi Noguchi、Yasufumi Fuchi、Yoshiyuki Hari
DOI:10.1021/acs.orglett.2c03285
日期:2022.10.21
The rapid and facile generation of 4′-carbon radicals from oxime imidates of nucleosides via 1,5-hydrogen atom transfer induced by iminyl radicals was developed. The cyclization of 4′-carbon radicals with olefins, followed by the hydrolysis of imidate residues, provided various 2′-O,4′-C- and 3′-O,4′-C-bridged nucleosides. This operationally simple approach can be applied to the few-step syntheses
开发了通过亚胺基自由基诱导的 1,5-氢原子转移从核苷的肟亚胺酸酯快速简便地生成 4'-碳自由基。4'-碳自由基与烯烃环化,随后亚胺酸酯残基水解,提供各种 2'- O ,4'- C - 和 3'- O ,4'- C -桥接核苷。这种操作简单的方法可应用于 6' S -methyl-2'- O ,4'- C -ethylene-bridged 5-methyluridine (6' S -Me-ENA-T) 和S -的几步合成限制性乙基桥连 5-甲基尿苷 ( S -cEt-T)。