SYNTHESIS OF DENDRITIC POLYPYRIDINES WITH ETHOXYCARBONYL GROUPS AS SURFACE FUNCTIONALITY

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