Hydrochloric Acid → HCID 178514784, compound

Participants

Reaction Conditions

Reaction Steps

To a crude mixture of N-[2-({4-[4-(3-bromo-4-fluorophenyl)-5-oxo-4,5-dihydro-1,2,4-oxadiazol-3-yl]-1,2,5-oxadiazol-3-yl}amino)ethyl]sulfamide (2.4 mol) containing residual amounts of trifluoroacetic acid stirring in a 22 L flask was added THF (5 L). The resulting solution was cooled to 0° C. using an ice bath and 2 N NaOH (4 L) was added at a rate so that the temperature did not exceed 10° C. After stirring at ambient temperature for 3 h (LCMS indicated no starting material remained), the pH was adjusted to 3-4 with concentrated HCl (˜500 mL). The THF was removed in vacuo, and the resulting mixture was extracted with ethyl acetate (15 L). The organic layer was washed with water (5 L), brine (5 L), and the solvents removed in vacuo to afford a solid. The solid was triturated with MTBE (2×2 L), combined with three other reactions of the same size, and dried overnight in a convection oven to afford a white solid (3535 g). The solid was recrystallized (3×22 L flasks, 2:1 water:ethanol, 14.1 L each flask) and dried in a 50° C. convection oven to a constant weight to furnish the title compound as an off-white solid (3290 g, 78%). LCMS for C11H14BrFN7O4S (M+H)+: m/z=437.9, 439.9. 1H NMR (400 MHz, DMSO-d6): δ 11.51 (s, 1H), 8.90 (s, 1H), 7.17 (t, J=8.8 Hz, 1H), 7.11 (dd, J=6.1, 2.7 Hz, 1H), 6.76 (m, 1H), 6.71 (t, J=6.0 Hz, 1H), 6.59 (s, 2H), 6.23 (t, J=6.1 Hz, 1H), 3.35 (dd, J=10.9, 7.0 Hz, 2H), 3.10 (dd, J=12.1, 6.2 Hz, 2H).

Provenance & Evidence