Polyhalogenation-Facilitated Spirolactonization at the <i>meta</i>-Position of Phenols
作者:Jiaqi Cao、Youcai Ma、Liangzhen Hu、Wen Xia、Xiaohui Zhang、Yan Xiong
DOI:10.1021/acs.joc.2c02527
日期:2023.1.20
good understanding of the mechanism, the increase in number of bromine atoms was inferred rationally from the spirolactonization process, assisted by DFT calculations and high-resolution mass spectrometry. Mechanistic experiments suggest that the formation of a stable carbocation intermediate plays a great role in the migration of oxygen to spirolactonization.
一种新型脱芳烃螺内酯化/多卤化苯酚,采用高价碘 PhICl 2(碘苯二氯化物)作为氧化剂和氯源,具有不可或缺的碱,或仅使用 NBS(N-溴代琥珀酰亚胺),不含任何添加剂。卤化物参与是 3'-羟基-[1,1'-联苯]-2-羧酸级联反应的重要因素,具有良好的选择性和反应性,并诱导多个 C-卤素键和定向 C═O 的快速构建在温和条件下一步操作的债券。为了更好地理解该机制,在 DFT 计算和高分辨率质谱分析的帮助下,从螺内酯化过程中合理推断出溴原子数量的增加。机理实验表明,稳定的碳阳离子中间体的形成在氧迁移至螺内酯化过程中起着重要作用。