Hydrochloric Acid → 2-methyl-N-(thietan-3-yl)-4-[(5S)-5-(3,4,5-trichlorophenyl)-5-(trifluoromethyl)-4H-isoxazol-3-yl]benzamide

Participants

Reaction Conditions

Reaction Steps

To a solution of 2-methyl-4-[(5S)-5-(3,4,5-trichlorophenyl)-5-(trifluoromethyl)-4H-isoxazol-3-yl]benzoic acid (28.72 mmol, 13 g) in dichloromethane (100 mL) and N,N-dimethylformamide (0.2867 mmol, 0.0210 g) was added oxalyl chloride (4.836 g) dropwise at room temperature and under argon (the liberated hydrochloric acid gas was scrubbed with a sodium hydroxide 0.5N solution). The mixture was stirred at room temperature for 1 h and at 30° C. for 20 min until the gas evolution ceased. The reaction mixture was concentrated to dryness and redissolved in dichloromethane (100 mL), triethylamine (71.81 mmol, 7.340 g) was added at 0-5° C. under argon followed by dropwise addition of thietan-3-amine (28.72 mmol, 2.561 g). The mixture was allowed to warm to room temperature and stirred for 16 h. The mixture was extracted with aqueous hydrochloric acid (0.5N), water, brine, dried over MgSO4, filtered and evaporated affording the crude product. Purification over silica gel (eluent: CH2Cl2/EtOAc) yielded the title compound. LCMS (Method GR) RT 1.25 min, [M+H]+ 523/525; 1H-NMR (CDCl3, 400 MHz): 2.45 (s, 3H), 3.35 (m, 2H), 3.50 (m, 2H), 3.60 (d, 1H), 74.10 (d, 1H), 5.40 (q, 1H), 6.20 (d, NH), 7.40 (s, 1H), 7.51 (d, 1H), 7.40 (s, 1H), 7.50 (s, 2H), 7.65 (s, 2H). 19F-NMR (CDCl3, 376 MHz): −79.43.

Provenance & Evidence