Dichloromethane → (E)-5-(4-(4,4,4-trifluoro-3-(3,4,5-trichlorophenyl)but-1-en-1-yl)-2-(trifluoromethyl)phenyl)-6-oxa-4-azaspiro[2.4]hept-4-en-7-one

Participants

Reaction Steps

A 500 mL rb flask equipped with a magnetic stir bar and a temperature probe was charged with (E)-1-(4-(4,4,4-trifluoro-3-(3,4,5-trichlorophenyl)but-1-en-1-yl)-2-(trifluoromethyl)benzamido)cyclopropanecarboxylic acid (9.2 g, 16.41 mmol), dichloromethane (DCM) (30 mL) and cooled in an ice water bath. With stirring, EDC HCl (3.15 g, 16.4 mmol) was added in one portion. After 5 min, the ice bath was removed and the reaction mixture was allowed to warm to room temperature and stirred for 2 h. The reaction mixture was diluted with DCM (100 mL), washed with brine (1×100 mL), dried over sodium sulfate and concentrated. The crude material was purified via an ISCO Rf medium pressure chromatography apparatus using a 330 g normal phase silica gel column and eluting with 0-30% EtOAc/hex gradient to afford the title compound (6.5 g, 73%): 1H NMR (400 MHz, CDCl3) δ 7.91 (d, J=8.1 Hz, 1H), 7.80 (dd, J=1.8, 0.8 Hz, 1H), 7.67 (dd, J=8.2, 1.8 Hz, 1H), 7.42 (s, 2H), 6.66 (d, J=15.9 Hz, 1H), 6.51 (dd, J=15.9, 7.8 Hz, 1H), 4.15 (p, J=8.7 Hz, 1H), 1.99-1.91 (m, 2H), 1.89-1.79 (m, 2H); 19F NMR (376 MHz, CDCl3) δ −59.47, −68.51; ESIMS m/z 544.2 ([M+H]+).

Provenance & Evidence