Sodium Hydroxide → 1-(4-Fluoro-benzyl)-2-oxo-1,2-dihydro-pyridine-3-carboxylic acid

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

A solution of methyl 1-(4-fluorobenzyl)-2-oxo-1,2-dihydropyridine-3-carboxylate (2.4 g, 9.2 mmol, 1.0 eq) in MeOH (25 ml) was treated with 5 N aqueous sodium hydroxide (4.6 mL, 24 mmol, 2.6 eq) at room temperature and the reaction mixture was stirred for 15 h. The reaction mixture was concentrated in vacuo, diluted with water and the solution was extracted with ethyl acetate (discarding the organic fraction). The aqueous fraction was cooled to 0° C. and acidified with concentrated HCl. The resulting solid was filtered, washed with water and the solid dried in vacuo to afford the product (1.6 g, 70%) which was sufficiently pure to use in the subsequent step without further purification. 1H NMR (DMSO-d6) δ 8.44–8.39 (m, 2H), 7.46–7.42 (m, 2H), 7.24–7.18 (m, 2H), 6.78 (d, 1H, J=6.98 Hz), 5.31 (s, 2H); HRMS(ESI), calcd.: 248.0723, found: 248.0718.

Herkunft & Nachweise