Hydrochloric Acid → [4-(Pyridin-2-ylsulfamoyl)-phenyl]-acetic acid ethyl ester

Participants

Reaction Conditions

Reaction Steps

A stirred solution of 2-aminopyridine (282 mg, 3.0 mmol) in dry pyridine (5.0 mL) was treated with (4-chlorosulfonyl-phenyl)-acetic acid ethyl ester (prepared according to the procedure of Kawashima et. al, as described in Chem. Pharm. Bull. 1995, 43(7), 1132) dropwise at 0–5° C. under argon. Upon completion of addition, the reaction was slowly warmed to 25° C. The reaction was stirred at 25° C. until no starting materials remained. At this time, the reaction was cooled to 0° C. and was acidified to pH=5 with a 1.0M aqueous hydrochloric acid solution. The reaction mixture was poured into water and was extracted with ethyl acetate. The combined organic extracts were washed with water and a saturated aqueous sodium chloride solution, dried over magnesium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230–400 mesh, 3/97 methanol/methylene chloride) afforded [4-(pyridin-2-ylsulfamoyl)-phenyl]-acetic acid ethyl ester (0.26 g, 27%) as a colorless solid; 1H NMR (CDCl3, 300 MHz) δH 13.67 (broad s, 1H), 8.30 (dd, J=5.9, 1.1 Hz, 1H), 7.86 (d, J=8.4 Hz, 2H), 7.65 (tt, J=8.1, 1.7 Hz, 1H), 7.50–7.30 (m, 3H), 6.77 (t, J=6.3 Hz, 1H), 4.12 (q, J=7.0 Hz, 2H), 3.63 (s, 2H), 1.22 (t, J=7.0 Hz, 3H); LRMS for C15H16N2O4S (M+H)+ at m/z=321.

Provenance & Evidence