Synthesis of α-Difluoromethylene Ethers via Photoredox-Induced Hyperconjugative Ring Opening of <i>gem</i>-Difluorocyclopropanes
作者:Yu-Rou Zhao、Zhi-Yong Ma、Le Liu、Pin Gao、Xin-Hua Duan、Mingyou Hu
DOI:10.1021/acs.joc.2c03062
日期:2023.3.17
Precise construction of α-difluoromethylene ether (CF2–O) moiety in organic molecules is of high demand. Herein, a visible light-promoted reaction protocol for the synthesis of α-difluoromethylene ether from gem-difluorocyclopropane is described. The key ring-opening step is induced by hyperconjugative interaction of cyclopropane with photo-oxidized aromatic rings. This reaction is easy scale-up, and the
含氟化合物已在制药、农用化学品和材料科学中得到广泛应用。对有机分子中α-二氟亚甲基醚 (CF 2 – O) 部分的精确构建有很高的要求。本文介绍了一种可见光促进反应方案,用于从宝石-二氟环丙烷合成 α-二氟亚甲基醚。关键的开环步骤是由环丙烷与光氧化芳环的超共轭相互作用引起的。这种反应很容易放大,带有合成手柄的产品可以进一步操作。