Sulfamide → 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}sulfamide

Participants

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 (1.5 g, 3.0 mmol) and sulfamide (1.7 g, 18 mmol) in pyridine (60 mL) was heated in a microwave at 130° C. for 10 min. The reaction mixture was concentrated to give the crude 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}sulfamide. A solution of the crude intermediate in methanol (90 mL) was treated with 2N NaOH (12 mL, 24 mmol) and stirred at 25° C. for 30 min. The reaction mixture was treated with 6M HCl until the solution was acidic and extracted with ethyl acetate (250 mL). The organic layer was washed with water (100 mL) and brine (100 mL), dried over anhydrous sodium sulfate, filtered, and concentrated to give a crude residue. This material was purified by preparative LCMS to give the desired product (1.1 g, 82%) as a gummy solid. LCMS for C13H17F3N7O4S (M+H)+: m/z=424.0. 1H NMR (400 MHz, DMSO-d6): δ 11.6 (s, 1 H), 9.12 (s, 1 H), 7.37 (dd, J=8.0, 8.0 Hz, 1 H), 7.21-7.18 (m, 1H), 7.07 (s, 1 H), 6.95 (d, J=10.0 Hz, 1 H), 6.52 (br s, 3 H), 6.17 (t, J=6.0 Hz, 1 H), 3.28-3.22 (m, 2 H), 2.93-2.89 (m, 2 H), 1.77-1.73 (m, 2 H).

Provenance & Evidence