BF
<sub>3</sub>
⋅ Et
<sub>2</sub>
O Promoted Inverse‐Electron‐Demand Oxa‐Diels‐Alder Reaction of Alkylidene Isoxazol‐5‐ones with Unactivated Alkenes
作者:Yu Zheng、Shencheng Qian、Pengcheng Xu、Tianting Ma、Shenlin Huang
DOI:10.1002/adsc.202200805
日期:2022.11.22
fused dihydropyran isoxazole derivatives has been developed by employing an intermolecular inverse-electron-demand Diels-Alder reaction of readily available alkylidene isoxazol-5-ones with unactivated alkenes. The reaction was promoted by inexpensive and commercially available BF3 ⋅ Et2O without the use of metal Lewis acids. This cycloaddition transformation could proceed under mild conditions with broad
稠合二氢吡喃异恶唑衍生物的合成是通过使用容易获得的亚烷基异恶唑-5-酮与未活化烯烃的分子间反电子需求 Diels-Alder 反应开发的。在不使用金属路易斯酸的情况下,通过廉价且可商购的 BF 3 ⋅ Et 2 O 促进反应。这种环加成反应可以在温和的条件下进行,具有广泛的底物范围,提供多种双环 5,6-二氢-4 H-吡喃并 [3,2- d ] 异恶唑。