5-Amino-1-benzyl-2(1H)-pyridinone
A mixture of 1-benzyl-5-nitro-1H-pyridin-2-one (Justus Liebigs Ann. Chem. 484; 1930; 52) (1.0 g, 4.35 mmol), and granulated tin (3.5 g, 29.5 mmol) in concentrated hydrochloric acid (14 ml) was heated at 90° C. for 1.5 hours. The cooled solution was diluted with water, neutralised using sodium carbonate solution, and extracted with ethyl acetate (250 ml in total). The combined organic extracts were filtered, dried (MgSO4), and evaporated under reduced pressure to give the title compound as a pale green solid, (turned blue with time), 440 mg, 51%;
1H NMR (CDCl3, 250 MHz) δ: 4.12-4.47 (bs, 2H), 5.00 (s, 2H), 6.31 (d, 1H), 6.86 (s, 1H), 7.07 (m, 1H), 7.14-7.42 (m, 5H).
