Methyl Acrylate → Methyl 3-[3-(trifluoromethyl)phenyl]4,5-dihydroisoxazole-5-carboxylate

Participants

Reaction Steps

To a flask containing N-hydroxy-3-(trifluoromethyl)benzenecarboximidoyl chloride (2.0 g, 8.9 mmol) and methyl acrylate (0.7 g, 8 mmol) in methylene chloride (100 mL) at 0° C. under an inert atmosphere was added TEA (0.90 g, 8.8 mmol). The reaction mixture was slowly warmed to ambient temperature, stirred for 20 h, quenched with water (30 mL), and extracted with methylene chloride (2×50 mL). The organic extracts were combined, washed with saline solution (50 mL), dried over sodium sulfate, concentrated in vacuo, and chromatographed on silica gel, eluting with methylene chloride/methanol (100/1 to 95/5). The appropriate fractions were combined and concentrated in vacuo to give methyl 3-[3-(trifluoromethyl)phenyl]-4,5-dihydroisoxazole-5-carboxylate (2.3 g, 100%): LCMS: 274.2 (M+H+, 100%); 1H NMR: (CDCl3) δ 8.03 (s, 1H), 7.92 (d, 1H), 7.71 (d, 1H), 7.59 (dd, 1H), 5.28 (dd, 1H), 3.86 (s, 3H), 3.71 (dd, 2H).

Provenance & Evidence