A slurry of 3-(2,2,2-trifluoro-ethyl)-1H-quinazoline-2,4-dione (88 mg, 0.36 mmol) in THF (20 ml) was treated with BTPP (0.33 ml, 1.08 mmol) and stirred for 15 min at 23° C. [2-Chloromethyl-1-(3-methanesulfonyl-propyl)-1H-benzoimidazol-5-ylmethyl]-carbamic acid tert-butyl ester (150 mg, 0.36 mmol) was added and the mixture stirred at 23° C. for 12 h. The solvent was removed and the residue triturated with water. The residue was chromatographed to give 40 mg (18%) of [2-[2,4-dioxo-3-(2,2,2-trifluoro-ethyl)-3,4-dihydro-2H-quinazolin-1-ylmethyl]-1-(3-methanesulfonyl-propyl)-1H-benzoimidazol-5-ylmethyl]-carbamic acid tert-butyl ester as a white solid.
