作者:Chee Yong Gan、John N. Lambert
DOI:10.1039/a802922i
日期:——
[2 + 2] photocycloaddition between carbonyl compounds and electron rich alkenes to generate oxetane products. By the introduction of substituted cyclopropyl rings to the alkene components, the utility of this reaction has been extended to facilitate the synthesis of substituted tetrahydrooxepins. It is proposed that initial addition of oxygen radicals to cyclopropyl enol ethers generates cyclopropylmethyl
Paternò–Büchi反应是羰基化合物与富电子烯烃之间的[2 + 2]光环加成反应,以生成氧杂环丁烷产物。通过将取代的环丙基环引入烯烃组分,该反应的用途得到扩展,以促进取代的四氢氧杂环丁烷的合成。建议将氧自由基初始添加到环丙基烯醇醚中会生成环丙基甲基,当环丙烷环带有适当的自由基稳定基团(例如苯基,CO 2等等),经历快速裂解形成均一的1,7-双基自由基,然后重组以提供所观察到的四氢氧杂e产物。考察了各种自由基稳定取代基对四氢氧杂庚酸酯形成效率的重要性。