反应详情

4-[5-chloro-4-(4-cyano-6-trifluoromethyl-pyridin-3-yl)-2-(methyl-o-tolyl-carbamoyl)-phenoxy]-butyric acid tert-butyl ester (410 mg, 0.7 mmol) was stirred in a mixture of trifluoroacetic acid in DCM (1/1, 3 mL) for 2 hrs. Concentration followed by purification by HPLC gave 4-[5-chloro-4-(4-cyano-6-trifluoromethyl-pyridin-3-yl)-2-(methyl-o-tolyl-carbamoyl)-phenoxy]-butyric acid 20-1 (62 mg). MS: 532.6 (M+H)+; tR=5.29 min (method 3). NMR (CDCl3, reported as the major isomer of cis-trans amide rotamers), δ, 8.54 (1H, s), 7.94 (1H, s), 7.34-7.25 (1H, m), 7.18-7.14 (2H, m), 7.14-7.04 (1H, m), 7.02 (1H, s), 6.92 (1H, s), 4.08 (2H, t, J=6.3 Hz), 3.40 (3H, s), 2.62 (2H, t, J=6.3 Hz), 2.30-2.18 (2H, m), 2.57 (3H, s).

1. concentrationConcentration
2. customfollowed by purification by HPLC