Diisopropylethylamine → 4-(5-(3,5-dichlorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)-N-((3,3-diethyl-1-hydroxy-1,3-dihydrobenzo[c][1,2]oxaborol-6-yl)methyl)-2-methylbenzamide

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Reaction Steps

A solution of 4-(5-(3,5-dichlorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)-2-methylbenzoic acid (100 mg, 0.24 mmol) and DIPEA (151 mg, 1.17 mmol) in DMF (5.0 mL) was stirred at rt for 5 min and then HATU (180 mg, 0.47 mmol) was added. The mixture was stirred for 10 min prior to the addition of 6-(aminomethyl)-3,3-diethylbenzo[c][1,2]oxaborol-1(3H)-ol hydrochloride (63 mg, 0.25 mmol). And the resulting mixture was stirred at rt overnight. It was then concentrated under vacuum, and the residue was partitioned between 1N HCl and ethyl acetate. The organic layer separated was concentrated under vacuum, and the residue was purified by column chromatography and prep-HPLC to provide the final title compound (118 mg, yield 79%). 1H NMR (400 MHz, DMSO-d6): δ 9.00 (s, 1H), 8.88 (t, 1H), 7.80 (t, 1H), 7.60 (m, 5H), 7.42 (d, 1H), 7.40 (d, 1H), 7.24 (d, 1H), 4.47 (d, 2H), 4.36 (d, 2H), 4.27 (d, 2H), 2.35 (s, 3H), 1.78 (m, 4H), 0.52 (t, 6H) ppm; HPLC purity: 92.43% at 220 nm and 93.69% at 254 nm; MS: m/z=620; 661 [M+CH3CN].

Provenance & Evidence