Visible Light-Induced Aerobic Epoxidation of α,β-Unsaturated Ketones Mediated by Amidines
作者:Yufeng Wu、Guangli Zhou、Qingwei Meng、Xiaofei Tang、Guangzhi Liu、Hang Yin、Jingnan Zhao、Fan Yang、Zongyi Yu、Yi Luo
DOI:10.1021/acs.joc.8b01710
日期:2018.11.2
photoepoxidation of α,β-unsaturated ketones driven by visible light in the presence of tetramethylguanidine (3b), tetraphenylporphine (H2TPP), and molecular oxygen under mild conditions was revealed. The corresponding α,β-epoxy ketones were obtained in yields of up to 94% in 96 h. The reaction time was shortened to 4.6 h by flow synthesis. The mechanism related to singlet oxygen was supported by experiments
在温和条件下,在四甲基胍(3b),四苯基卟啉(H 2 TPP)和分子氧的存在下,可见光驱动α,β-不饱和酮的有氧光环氧化。在96小时内以高达94%的产率获得了相应的α,β-环氧酮。通过流动合成将反应时间缩短至4.6小时。实验和密度泛函理论(DFT)计算支持了与单线态氧有关的机理。