Potassium tert-butoxide-mediated synthesis of unsymmetrical diaryl ethers, sulfides and selenides from aryl bromides
作者:Amit Kumar、Bhagat Singh Bhakuni、Ch. Durga Prasad、Shailesh Kumar、Sangit Kumar
DOI:10.1016/j.tet.2013.04.113
日期:2013.7
been studied from aryl bromide and phenol/aryl disulfide/diselenide substrates. A series of unsymmetrical diaryl chalcogenides were accessed from aryl bromide and diaryl dichalcogenide precursors by using 2.5 equiv of potassium tert-butoxide in DMSO at 80 °C. Unsymmetrical diaryl ethers were also obtained by using phenol precursors at 40–45 °C. Aryl bromides with methyl, trifluoromethyl, methoxy and
钾叔丁醇介导的碳-硫族C-E(E = O,S和Se)偶联反应已经从芳基溴和苯酚/芳基二硫化物/二硒化物衬底的研究。通过使用2.5当量的叔碳酸钾从芳基溴化物和二芳基二卤化钨前体中获得了一系列不对称的二芳基硫属元素化物于80°C的DMSO中的丁酸。还可以通过在40–45°C下使用苯酚前体获得不对称的二芳基醚。具有甲基,三氟甲基,甲氧基和硝基取代基的芳基溴化物在形成碳硫族元素的反应中具有相容性。当与酚/二芳基二硫化物/二硒化物反应时,4-甲氧基,甲基,三氟甲基取代的溴苯底物产生两种区域异构体:3-取代的和4-取代的二芳基硫属元素化物。在反应混合物中形成两个区域异构的二芳基硫属元素化物表明,叔丁醇钾与溴苯反应生成苯炔中间体,随后该中间体与二芳基二硫属元素化物反应,最终得到4-取代的和3-取代的二芳基硫属元素化物的区域异构体混合物。