Controlled release of 5-Fluorouracil by a novel L-Lysine based polyesterurethane material synthesized from Epoxide and CO2 via a novel dicopper salen catalyst

Controlled release of anticancer drug 5-Fluorouracil by several delivery systems are known including porous polymeric materials. Herein we report a novel L-lysine based porous polyesterurethane material 1 which acts as a controlled release vehicle for 5-Fluorouracil. Polyesterurethane material 1 was synthesized from a green isocyanate and phosgene free synthetic route involving conversion of epoxide 2-(phenoxymethyl)oxirane and CO2 to cyclic carbonate 2 followed by ring opening with an amino acid L-Lysine to a bishydroxy compound 3 under green aqueous reaction condition. The bishydroxy compound 3 was subsequently reacted with 0.66 equivalent of trimesyl chloride in presence of triethyl amine to get the polyesterurethane material 1. The polyesterurethane material 1 was characterized via NMR, IR and MALDI analysis. From the SEM image of the polyesterurethane 1 and 5-Fluorouracil encapsulated polyesterurethane 1 it is evident that material 1 remain with porous topology which is filled by 5-Fluorouracil that is further evidenced by EDX spectroscopy with the presence of Fluorine. The controlled release of 5-Fluorouracil from the drug encapsulated 1 was monitored via UV visible spectroscopy at pH 7.4.