Diisopropylethylamine → 1-[4-(4-Nitro-3-trifluoromethyl-phenylamino)-piperidin-1-yl]-3-[4-(5-trifluoromethyl-1,3,4-thiadiazol-2-yl)-piperazin-1-yl]-propan-1-one

Participants

Reaction Steps

3-[4-(5-Trifluoromethyl-[1,3,4]thiadiazol-2-yl)-piperazin-1-yl]-propionic acid lithium salt (15 mg; 0.05 mmol, prepared in accordance with Example 123) and tetramethyl-O-(1H-benzotriazol-1-yl)uronium hexafluorophosphate (19 mg; 0.05 mmol) are diluted in a 2 to 1 mixture of dimethylformamide and tetrahydrofuran (0.75 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 added and the reaction is then stirred. After 4 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 (16 mg; 0.027 mmol). The structure was confirmed using Protocol I-D. Calculated mass=582; observed mass=582; HPLC retention time=1.41 min.

Provenance & Evidence