To a stirred solution of 2-[(3R)-3-fluoro-pyrrolidin-1-yl]-6-methyl-4-morpholin-4-yl-benzamide (0.13 g, 0.42 mmol) in tetrahydrofuran/benzene (1:1) (6 ml) is added tetrabutylammonium hydrogen sulfate (15.0 mg, 0.04 mmol) followed by the addition of 15% aqueous sodium hydroxide (3.7 ml) at room temperature. A solution of 4-chloro-benzyl bromide (0.087 g, 0.42 mmol) in tetrahydrofuran (1 ml) is slowly added to the solution and the resulting mixture is heated to 80° C. for 45 min. The mixture is cooled to room temperature and extracted with ethyl acetate (3×10 ml). The combined organic layers are washed with water (10 ml), brine (10 ml), dried over anhydrous sodium sulfate and concentrated in vacuo to get crude product, which is purified by flash column chromatography (silica gel, 10% acetone/hexane) to yield N-[(4-chlorophenyl)-methyl]-2-[(3R)-3-fluoro-pyrrolidin-1-yl]-6-methyl-4-morpholin-4-yl-benzamide (example 38) (0.04 g, 0.09 mmol, 22%). [M+H]+ 432.2.
