Triethylamine → N-{3-[(4-{5-oxo-4-[3-(trifluoromethyl)phenyl]-4,5-dihydro-1,2,4-oxadiazol-3-yl}-1,2,5-oxadiazol-3-yl)amino]propyl}methanesulfonamide

Participants

Reaction Conditions

Reaction Steps

A solution of 3-{4-[(3-aminopropyl)amino]-1,2,5-oxadiazol-3-yl}-4-[3-(trifluoromethyl)phenyl]-1,2,4-oxadiazol-5(4H)-one hydroiodide (from Example 15, Step F; 25 mg, 50 μmol) in dichloromethane (1 mL) was treated with triethylamine (17 μL, 0.12 mmol) and methanesulfonyl chloride (6 μL, 70 μmol) and stirred at 25° C. for 2 h. The reaction mixture was concentrated to give the intermediate, N-{3-[(4-{5-oxo-4-[3-(trifluoromethyl)phenyl]-4,5-dihydro-1,2,4-oxadiazol-3-yl}-1,2,5-oxadiazol-3-yl)amino]propyl}methanesulfonamide, as a crude residue which was used without further purification. A solution of the crude intermediate in methanol (1 mL) was treated with 2 N NaOH (0.25 mL, 0.5 mmol) and stirred at 25° C. for 30 min. The reaction mixture was treated with acetic acid (50 μL, 0.9 mmol), filtered and purified by preparative LCMS to give the desired product (13 mg, 65%) as a solid. LCMS for C14H18F3N6O4S (M+H)+: m/z=423.1. 1H NMR (400 MHz, DMSO-d6): δ 11.6 (s, 1H), 9.11 (s, 1H), 7.37 (dd, J=8.0, 8.0 Hz, 1H), 7.20 (d, J=7.8 Hz, 1H), 7.07-7.01 (m, 2H), 6.96 (d, J=8.0 Hz, 1H), 6.20 (t, J=5.9 Hz, 1H), 3.27-3.22 (m, 2H), 2.99-2.94 (m, 2H), 2.87 (s, 3H), 1.78-1.71 (m, 2H).

Provenance & Evidence