Synthesis of 2-Isoxazoline <i>N</i>-Oxides by Copper-Mediated Radical Annulation of Alkenes with α-Nitrobenzyl Bromides
作者:Masayuki Iwasaki、Yuichi Ikemoto、Yasushi Nishihara
DOI:10.1021/acs.orglett.0c02781
日期:2020.10.2
reaction is promoted simply by a copper salt to produce the corresponding 2-isoxazoline N-oxides with perfect regioselectivity. The present method can be conducted under mild conditions, affording a diverse array of 2-isoxazoline N-oxides. The obtained products can readily be converted to the related heterocycles such as 2-isoxazoline and isoxazole. A radical-polar crossover pathway initiated by single-electron
已经开发了用α-硝基苄基溴进行的铜介导的烯烃的[3 + 2]环化反应。简单地通过铜盐促进反应,以产生具有完美区域选择性的相应的2-异恶唑啉N-氧化物。本方法可以在温和的条件下进行,得到各种各样的2-异恶唑啉N-氧化物。所获得的产物可以容易地转化为相关的杂环,例如2-异恶唑啉和异恶唑。提出了由单电子从亚硝酸盐转移至铜盐引发的自由基-极性交叉途径。