2,6-Dichloro-3-nitropyridin-4-amine → 6-Chloro-2-methoxy-3-nitro-4-pyridinamine

반응식

Cl[C:2]1[C:7]([N+:8]([O-:10])=[O:9])=[C:6]([NH2:11])[CH:5]=[C:4]([Cl:12])[N:3]=1.[CH3:13][O-:14].[Na+]>CO.CCCCCC>[Cl:12][C:4]1[N:3]=[C:2]([O:14][CH3:13])[C:7]([N+:8]([O-:10])=[O:9])=[C:6]([NH2:11])[CH:5]=1

참가 물질

실험 절차

To a stirred solution of 2,6-dichloro-3-nitro-pyridin-4-ylamine (20.0 g, 96.1 mmol) in MeOH (100 mL) was added 0.5 M NaOMe in MeOH (423 mL, 211 mmol) dropwise. The resulting mixture was stirred at room temperature for 3 h. The resulting mixture was then concentrated to ca. ⅓ of the volume and slowly poured into saturated NH4Cl solution (200 mL). The resulting mixture was extracted with EtOAc (3×150 mL). The combined EtOAc extracts were dried (Na2SO4), and concentrated in vacuo to yield a tan solid which was suspended in hexane (500 mL) and sonicated for 10 min. The resulting solid was collected by suction filtration and dried under suction to yield 6-chloro-2-methoxy-3-nitro-pyridin-4-ylamine as a powder. 1H-NMR (400 MHz, CDCl3) δ: 6.39 (s, 1H), 6.28 (br s, 2H), 4.05 (s, 3H).