Abstract
Synthesis of two new types of ‘head-to-head’ N, N-alkoxy bisbenzimidazoles is described. The proposed intermediate N-oxy benzimidazole from base-induced heterocyclization of N-alkylnitroanilines can be trapped with a biselectrophile (to give an N, N-linked dimer), or double heterocyclization of dimeric nitroanilines can be intercepted by electrophile trapping of both N-oxybenzimidazole termini to give C2,C2-linked dimers. These represent two regioisomeric motifs constituting new classes of benzimidazole dimers.
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