반응 #494610

반응 방정식

EtOAc

NaOH

4-Fluoro-5-(2-methoxy-5-nitro-phenyl)-1-methyl-1H-pyrazole

→

3-(4-fluoro-2-methyl-2H-pyrazol-3-yl)-4-methoxy-phenylamine

수율 47.0%

용매

EtOH

반응 조건

후처리

1. 1
   온도to cool to room temperature
2. 2
   기타the organic layer was separated
3. 3
   추출The aqueous layer was extracted with EtOAc (2×50mL)
4. 4
   건조dried over Na2SO4
5. 5
   여과filtered
6. 6
   기타the solvent removed under reduced pressure
7. 7
   workup.DISSOLUTIONThe residue was dissolved in DMSO (5 ml)
8. 8
   기타purified by preparative HPLC

실험 절차

4-Fluoro-5-(2-methoxy-5-nitro-phenyl)-1-methyl-1H-pyrazole (205 mg, 0.817 mmol) in EtOH (25 mL) was treated with Sn(II) chloride dihydrate (626.3 mg, 2.45 mmol) and heated to 50° C. for 12 hours. The reaction was allowed to cool to room temperature and 10% NaOH (100 ml) was added. EtOAc (50 ml) was added and the organic layer was separated. The aqueous layer was extracted with EtOAc (2×50mL) and the organics combined, dried over Na2SO4, filtered, and the solvent removed under reduced pressure. The residue was dissolved in DMSO (5 ml), and purified by preparative HPLC to afford 85 mg (47%) of 3-(4-fluoro-2-methyl-2H-pyrazol-3-yl)-4-methoxy-phenylamine as a light brown oil. LCMS m/z (%)=222 (M+H, 100). 1H NMR (400 MHz, CDCl3) δ: 7.38 (d, JH,F=4.8 Hz, 1H), 6.86 (d, J=8.8 Hz, 1H), 6.79 (dd, J1=8.8 Hz, J2=2.8 Hz, 1H), 6.64 (d, J=2.8 Hz, 1H), 3.75 (s, 3H), 3.69 (s, 3H), 3.21 (s, 2H). 19F NMR (376 MHz, CDCl3) δ: −175.50 (d, JH,F=5.3 Hz, 1F).

출처