Diisopropylethylamine → 4-[1-(4-Tert-butyl-phenyl)-piperidin-4-yl]-1-[4-(4-nitro-3-trifluoromethyl-phenylamino)-piperidin-1-yl]-butan-1-one

Participants

Reaction Steps

To a solution of 4-[1-(4-tert-butyl-phenyl)-piperidin-4-yl]-butyric acid lithium salt (15 mg; 0.05 mmol, prepared in accordance with Example 136) in tetrahydrofuran (0.5 mL) is added tetramethyl-O-(1H-benzotriazol-1-yl)uronium hexafluorophosphate (19 mg; 0.05 mmol) in dimethylformamide (0.25 mL). A solution of (4-nitro-3-trifluoromethyl-phenyl)-piperidin-4-yl-amine hydrochloride (16 mg; 0.05 mmol, prepared in accordance with Example 8) in dimethylformamide (0.25 mL) and diisopropylethyl amine (25 μL; 0.15 mmol) are then added and the reaction is stirred. After 3 hours at room temperature, aluminium oxide (90 active basic) is added and stirring is continued for 40 minutes. The solids are removed by filtration and the filtrate is concentrated under high vacuum. The obtained residue is purified by preparative HPLC to afford the desired compound (14 mg; 0.023 mmol). The structure was confirmed using Protocol I-D. Calculated mass=575; observed mass=575; HPLC retention time=1.70 min.

Provenance & Evidence