2-Aminophenol → HCID 1211386, Verbindung

A solution of 2-chloronicotinoyl chloride (2.91 g, 16.6 mmol) in ethyl acetate (50 mL) was added to a mixture of 2-aminophenol (2.00 g, 18.3 mmol) and DIPEA (4.8 mL, 27.5 mmol) in ethyl acetate (50 mL) at 4° C. The reaction mixture was stirred for 1 hour. The organic mixture was washed with water and brine then concentrated under reduced pressure. The residue was dissolved in ethanol/THF 1:1 (75 mL) and 15% sodium hydroxide (25 mL) and the mixture was stirred at 50° C. for 45 min. The mixture was cooled down to room temperature and concentrated in vacuo to one third volume and then acidified to pH=2 with 3M HCl. The solid was filtered, washed with water and dried to afford title compound 13 (3.69 g, 81%) as a beige solid. LRMS (ESI): (calc) 248.04. (found) 249.2 (MH)+.