Metal-Free Synthesis of <i>ortho</i>-CHO Diaryl Ethers by a Three-Component Sequential Coupling
作者:Fangliang Liu、Huameng Yang、Xinquan Hu、Gaoxi Jiang
DOI:10.1021/ol503224u
日期:2014.12.19
A practical, metal-free, and highly chemoselective approach was developed for the synthesis of ortho-CHO diaryl ethers by a three-component sequential coupling of arynes, N,N-dimethylformamide (DMF), and diaryliodonium salts. Diverse functional groups including halo, nitryl, and bulky substituents and heteroaromatics are well tolerated. Mechanistically, isotopic tracer experiments reveal that the diaryliodonium
通过芳烃,N,N-二甲基甲酰胺(DMF)和二芳基碘鎓盐的三组分顺序偶联,开发了一种实用,无金属且高度化学选择性的方法,用于合成邻-CHO二芳基醚。包括卤素,硝酰基和庞大的取代基和杂芳族化合物在内的各种官能团均具有良好的耐受性。从机理上讲,同位素示踪剂实验表明,二芳基碘鎓盐可作为亲电子试剂来捕获由芳烃和DMF的[2 + 2]环化生成的瞬态中间体。