Diisopropylethylamine → {4-[4-(3,5-Bis-trifluoromethyl-benzenesulfonylamino)-phenyl]-6-fluoro-3-methyl-naphthalen-2-yl}-acetic acid methyl ester

Participants

Reaction Steps

To a solution of [4-(4-amino-phenyl)-6-fluoro-3-methyl-naphthalen-2-yl]-acetic acid methyl ester (55 mg, 0.17 mmol) and 3,5-bis(trifluoromethyl)benzenesulfonyl chloride (54 mg, 0.17 mmol) in THF (3 mL) was added diisopropylethylamine (62 mg, 0.48 mmol) at 0° C. under nitrogen. After addition, the reaction mixture was warmed to room temperature and stirred for 3 hours. The solvent was removed under vacuum and the residue was diluted with water (10 mL). The mixture was extracted with ethyl acetate (2×20 mL). The combined organic extracts were washed with brine solution (20 mL) and dried over anhydrous magnesium sulfate. Filtration of the drying agent and concentration of the solvent under vacuum gave the crude residue which was purified using an ISCO (12 g) column, eluting with 2-25% ethyl acetate in hexanes, to afford {4-[4-(3,5-bis-trifluoromethyl-benzenesulfonylamino)-phenyl]-6-fluoro-3-methyl-naphthalen-2-yl}-acetic acid methyl ester (21.5 mg, 21%) as a light brown solid. 1H NMR (300 MHz, CDCl3) δ ppm 8.23 (s, 2 H), 8.09 (s, 1 H), 7.78 (dd, J=8.8, 5.7 Hz, 1 H), 7.73 (s, 1 H), 7.11-7.24 (m, 5 H), 7.04 (s, 1 H), 6.73 (d, J=10.9 Hz, 1 H), 3.87 (s, 2 H), 3.75 (s, 3 H), 2.07 (s, 3 H). HRMS calcd. for C28H19F7NO4S [(M−H)−] 598.0928, obsd. 598.0925.

Provenance & Evidence