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A double Ullmann coupling reaction successfully takes place between 4,5-diaryl-2-(2-bromophenyl)-1H-imidazoles and 2-bromophenols in the presence of Cs2CO3. This procedure is catalyzed by copper(I) iodide and o-phenanthroline and provides an efficient method for the synthesis of dibenzo[b,f]imidazo[1,2-d][1,4]oxazepine derivatives in good yields.

A novel method for the synthesis of dibenzo[b,f]imidazo[1,2-d] [1,4] oxazepine derivatives was described via cascade Csp 2 N and Csp 2 O bond constructions. It was a crossed double Ullmann reactions using 4,5-diaryl-2-(2-hydroxylphenyl)-1H-imidazole as the double nucleophilic centers in the presence of Cs 2 CO 3 , while 1-bromo-2-iodobenzene was used as a substrate catalyzed by CuI and o-phenanthroline in good yields.