Under a nitrogen atmosphere in a flame-dried flask, sodium hydride (43 mg, 1.07 mmol, 60% oil dispersion) was washed with hexanes and then treated with tetrahydrofuran (THF) (8 mL), followed by 3-(4-chlorobenzyl)-imidazolidine-2,4-dione (235 mg, 1.04 mmol) and 2-(4-methylpiperazin-1-yl)-benzaldehyde (209 mg, 1.02 mmol), and an additional 2 mL of THF. After refluxing the mixture overnight, the solvent was removed and the residue was treated with aqueous ammonium chloride and aqueous sodium bicarbonate to a pH of 8, then extracted with methylene chloride. The organic extracts were washed with aqueous sodium chloride, dried and concentrated in vacuo to a yellow foam. The foam was crystallized from hot ethyl acetate: hexanes to give a solid, 240 mg (57%).
