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

Participants

Reaction Steps

To a solution of [4-(4-amino-phenyl)-6-chloro-3-methyl-naphthalen-2-yl]-acetic acid methyl ester (100 mg, 0.29 mmol) and 2-trifluoromethyl-benzenesulfonyl chloride (146 mg, 0.59 mmol) in THF (5.5 mL) was added diisopropylethylamine (0.15 mL, 0.85 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). Then, the organic compound was extracted into ethyl acetate (2×20 mL). The combined organic extracts were washed with brine solution (30 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 by using an ISCO (40 g) column chromatography eluting with 5-30% ethyl acetate in hexanes to afford {6-chloro-3-methyl-4-[4-(2-trifluoromethyl-benzenesulfonylamino)-phenyl]-naphthalen-2-yl}-acetic acid methyl ester (132 mg, 82%) as a light yellow foam. 1H NMR (300 MHz, DMSO-d6) δ ppm 10.80 (s, 1 H), 8.16 (d, J=7.2 Hz, 1 H), 8.03 (dd, J=7.2, 1.7 Hz, 1 H), 7.82-7.96 (m, 4 H), 7.45 (dd, J=8.8, 1.6 Hz, 1 H), 7.25 (d, J=8.5 Hz, 2 H), 7.12 (d, J=8.5 Hz, 2 H), 6.95 (d, J=1.6 Hz, 1 H), 3.92 (s, 2 H), 3.63 (s, 3 H), 1.98 (s, 3H). HRMS calcd. for C27H20ClF3NO4S [(M−H)−] 546.0759, obsd. 546.0762.

Provenance & Evidence