Copper-Mediated Vicarious Substitution of 1,3-Dinitrobenzene with lodophenols or lodomethyl Phenyl Sulfoxide/Sulfone
作者:Olof Haglund、Abdul A. K. M. Hai、Martin Nilsson
DOI:10.1055/s-1990-27061
日期:——
1,3-Dinitrobenzene reacts with 4-iodophenol or 2-iodophenol in the presence of copper(I) tert-butoxide and pyridine to give 2′,6′- dinitrobiphenyl-4-ol and 1-nitrodibenzofuran, respectively, in good yield. Similarly, iodomethyl phenyl sulfone or sulfoxide and 1,3-dinitrobenzene are selectively converted into 2,6-dinitrobenzyl phenyl sulfone and sulfoxide, respectively. We believe that the reactions proceed via Meisenheimer intermediates formed from 1,3-dinitrobenzene and the iodophenol, from which a proton and copper(I) iodide are eliminated. The result is a copper-mediated, selective vicarious nucleophilic substitution of hydrogen at C-2 of 1,3-dinitrobenzene.
在叔丁醇铜(I)和吡啶存在下,1,3-二硝基苯与 4-碘苯酚或 2-碘苯酚反应,分别生成 2′,6′-二硝基联苯-4-醇和 1-硝基二苯并呋喃,收率很高。同样,碘甲基苯砜或亚砜和 1,3-二硝基苯也可选择性地分别转化为 2,6-二硝基苯基苯砜和亚砜。我们认为,这些反应是通过 1,3-二硝基苯和碘苯酚形成的迈森海默中间体进行的。结果是在铜的介导下,1,3-二硝基苯 C-2 处的氢发生了选择性替代亲核置换。