Hydrochloric Acid → (E)-N-Hydroxy-3-(2-quinolinyl)-2-propenamide

Participants

Reaction Steps

To a solution of (E)-3-(2quinolinyl)-2-propenoic acid L3) (0.4 g, 2.0 mmol) in dry dimethylformamide (3 ml), at ice bath temperature (˜0° C.), under an atmosphere of argon, N,N′-carbonyldiimidazole (0.65 g, 4.0 mmol) was added over 15 minutes and the reaction mixture was stirred at this temperature for 2 hours. Triethylamine (0.85 ml, 6.0 mmol), followed by hydroxylamine hydrochloride (0.42 g, 6.0 mmol), were added to the reaction, and the obtained mixture was stirred at ice bath temperature for 1 hour, and then at room temperature overnight. The reaction mixture was poured into water (30 ml), acidified with 1 N HCl to pH 5 and extracted with ethyl acetate (3×40 ml). The combined extracts were washed with water (50 ml), brine (20 ml), and dried (Na2SO4). The solvent was evaporated and the residue was chromatographed on silica gel with acetonitrile-water (20:1) as eluent to give the title compound as white crystals. M.p. 159.5-160.5° C. 1H NMR (DMSO-d6, HMDSO), δ: 7.12 (1H, d, J=16.0 Hz); 7.49-8.18 (6H, m); 8.44 (1H, d, J=8.0 Hz); 10.13 (2H, br s). HPLC analysis on Symmetry C8 column: impurities 2.0% (column size 3.9×150 mm; mobile phase acetonitrile—0.1M phosphate buffer, pH 2.5, 20:80; detector UV 254 nm; flow rate 1.2 ml/min; sample concentration 0.5 mg/ml). Anal. Calcd for C12H10N2O2*H2O: C, 62.06; H, 5.21; N, 12.06. Found, %: C, 61.95; H, 4.91; N, 12.07.

Provenance & Evidence