Synthesis of Isoxazolidines by Intramolecular Hydroamination of <i>N</i>-Alkoxyamides in the Presence of a Visible-Light Photoredox Catalyst
作者:Hayate Ishizuka、Kanna Adachi、Minami Odagi、Kazuo Nagasawa
DOI:10.1246/bcsj.20190127
日期:2019.9.15
N-Acyl isoxazolidines were obtained in moderate to good yields by intramolecular hydroamination of N-alkoxyamides in the presence of a ruthenium photocatalyst. In this reaction, the N-alkoxyamide anion generated by deprotonation undergoes photocatalyzed single-electron-transfer (SET) oxidation to generate the corresponding radical, which cyclizes to afford the isoxazolidine ring. Notably, this method was applicable to a macrocyclic substrate, affording the corresponding 12-membered macrocycle-containing product.
在钌光催化剂的作用下,通过对 N-烷氧基酰胺进行分子内氢化反应,以中等至良好的产率获得了 N-酰基异噁唑烷。在该反应中,通过去质子化生成的 N-烷氧基酰胺阴离子经过光催化单电子转移(SET)氧化生成相应的自由基,自由基环化生成异噁唑烷环。值得注意的是,这种方法适用于大环底物,可得到相应的含 12 个大环的产物。