Ethyl Acetate → 5-(5-(3,5-dichloro-4-(2,2,2-trifluoroethoxy)phenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)-3,3-dimethylbenzo[c][1,2]oxaborol-1(3H)-ol

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Reaction Steps

To a solution of (Z)—N,1-dihydroxy-3,3-dimethyl-1,3-dihydrobenzo[c][1,2]oxaborole-5-carbimidoyl chloride (253 mg, 1.06 mmol) and 1,3-dichloro-2-(2,2,2-trifluoroethoxy)-5-(3,3,3-trifluoroprop-1-en-2-yl)benzene (360 mg, 1.06 mmol) in DMF (10 mL) at rt was added TEA (107 mg, 1.06 mmol). The reaction mixture was stirred at rt for 18 h, poured into ice-water and extracted with EA (20 mL). The organic layer was washed with brine, dried over Na2SO4, filtered and concentrated under reduced pressure. The residue was purified by column chromatography over silica gel eluted with PE:EA (6:1) to give the final title compound (105 mg; yield 18.3%) as a white solid. 1H NMR (400 MHz, DMSO-d6): δ 9.20 (s, 1H), 7.76-7.69 (m, 5H), 4.80 (q, J=8.8 Hz, 2H), 4.37 (q, J=18.4 Hz, 2H), 1.48 (s,6H) ppm; HPLC purity: 96.2% at 220 nm and 98.3% at 254 nm; MS: m/z=542.2 (M+, ESI+).

Provenance & Evidence