Synthesis of 6,7-dihydro-5H-dibenzo[c,e]azepines and biaryls by palladium-catalyzed Ullmann reaction
作者:Ming Yu、Ri-Yuan Tang、Jin-Heng Li
DOI:10.1016/j.tet.2009.02.040
日期:2009.4
A novel palladium-catalyzed Ullmann protocol is described for the synthesis of 6,7-dihydro-5H-dibenzo[c,e]azepines and biaryls. In the presence of Pd(OAc)2 and KOAc, intramolecular or intermolecular Ullmann coupling of aryl halides proceeds efficiently under ligand-free and aerobic conditions to afford the corresponding 6,7-dihydro-5H-dibenzo[c,e]azepines and biaryls in moderate to excellent yields
描述了一种新颖的钯催化的Ullmann方案,用于合成6,7-二氢-5 H-二苯并[ c,e ]氮杂和联芳基。在Pd(OAc)2和KOAc存在下,芳基卤化物的分子内或分子间Ullmann偶联在无配体和需氧条件下有效进行,从而提供相应的6,7-dihydro-5 H -dibenzo [ c,e ]氮杂环庚烷和亚芳基化合物,产率中等至优异。