Synthesis of dendritic polypyridines with ethoxycarbonyl groups as surface functionality

The convergent synthesis of dendritic polypyridines having an outer tier of pyridine rings 2,6-difunctionalized with ethoxycarbonyl groups is described, The dendritic fragments were prepared using 4-benzyloxy-2,6-bis(chloromethyl)pyridine and diethyl 4-hydroxypyridine-2,6-dicarboxylate as the building blocks. The final step in the synthesis was the coupling of the dendritic fragments to the trifunctional core 1,3,5-tris(bromomethyl)benzene. The data obtained by spectroscopic techniques correlate well with the structures proposed.