Hydrochloric Acid → N-((1-hydroxy-3,3-dimethyl-1,3-dihydrobenzo[c][1,2]oxaborol-5-yl)methyl)-2-methyl-4-(5-(3,4,5-trichlorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)benzamide

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Reaction Steps

The solution of 2-methyl-4-(5-(3,4,5-trichlorophenyl)-5-(trifluoromethyl)-4,5-dihydro-isoxazol-3-yl)benzoic acid (300 mg, 0.665 mmol) and HATU (505.4 mg, 1.33 mmol) in CH3CN (15 mL) at rt was stirred for 5 min. The mixture was added to a solution of 5-(aminomethyl)-3,3-dimethylbenzo[c][1,2]oxaborol-1(3H)-ol hydrochloride (181.1 mg, 0.798 mmol) and TEA (268.7 mg, 2.66 mmol) in CH3CN (15 mL). Then the mixture was stirred at rt for 2 h. The solution was acidified with HCl (1 N) and extracted with EA. The combined organic layers were washed with brine, dried over Na2SO4, and concentrated under reduced pressure. The residue was purified by prep-TLC (PE:EA=2:1) to give the final title compound (105 mg, yield 25%): 1H NMR (300 MHz, DMSO-d6): δ 9.0 (s, 1H), 8.95 (t, 1H), 7.83 (s, 2H), 7.64-7.59 (m, 3 H), 7.47 (d, 1H), 7.34-7.29 (m, 2H), 4.52-4.50 (d, 2H), 4.37-4.34 (m, 2 H), 2.38 (s, 3H), 1.44 (s, 6 H); HPLC purity: 98.1% at 220 nm and 98.8% at 254 nm; MS: m/z=625 and 627 [M+H]+.

Provenance & Evidence