A convenient approach to the synthesis of a novel side chain dendritic oligourethane (SCDOU) (1) derived from ester terminated polyamidoamine (PAMAM) dendritic diol (G 3.5) (1a) with 2,4-toluene diisocyanate (TDI) was reported. Polymerization was conducted in bulk by using the catalytic amount of dibutyl tindilaurate (DBTD). The PAMAM dendritic diol as well as the side chain dendritic polyurethane were thoroughly characterized by means of IR, NMR spectroscopy.