Hydrochloric Acid → 5-(4-Nitrophenyl)thiazole-2-carboxylic acid

Beteiligte Stoffe

Reaktionsschritte

Ethyl 5-(4-nitrophenyl)thiazole-2-carboxylate (Intermediate 2, step A, 3.6 g) was dissolved in THF (90 ml). 1 Molar aqueous NaOH (52 ml) was added and stirred at RT for 15-20 minutes. The reaction mixture was acidified with 1M HCl, extracted with EtOAc. The organic layer was washed with brine, dried over Na2SO4 and concentrated under reduced pressure to get pale yellow colored solid. Solid was crystallized in EtOAc/Pet ether to yield 2.48 g (76%) of the title compound. 1H NMR (DMSO-d6, 300 MHz): δ 14.21 (bs, 1H), 8.7 (s, 1H), 8.31 (d, 2H), 8.1 (d, 2H); MS (ES+): m/z 251 (M+1).

Herkunft & Nachweise