Transition metal-free construction of trinuclear N-fused hybrid scaffolds by double nucleophilic aromatic substitution under microwave irradiation

Treatment of 2-(2-bromoaryl)- and 2-(2-bromovinyl)benzimidazoles with 2-aminoazoles in the presence of a base under microwave irradiation triggers double C(sp 2 )-N coupling to form trinuclear N-fused hybrid scaffolds. A reaction pathway involving nucleophilic aromatic substitution (S N Ar) accompanied by ammonia evolution is proposed as a key step of this transition metal-free process. A green construction of trinuclear N-fused hybrid scaffolds by transition metal-free double C(sp 2 )-N coupling of 2-(2-bromoaryl)- and 2-(2-bromovinyl)benzimidazoles with 2-aminoazoles under microwave irradiation has been developed.