Dimethylformamide → 1-(4-Methoxy-5-nitropyridin-2-yl)-4-methylpiperazine

HRID 527417

반응식

HRID 527417 반응식
Cl[C:2]1[CH:7]=[C:6]([O:8][CH3:9])[C:5]([N+:10]([O-:12])=[O:11])=[CH:4][N:3]=1.C([O-])([O-])=O.[K+].[K+].CN(C=O)C.[CH3:24][N:25]1[CH2:30][CH2:29][NH:28][CH2:27][CH2:26]1>O>[CH3:9][O:8][C:6]1[C:5]([N+:10]([O-:12])=[O:11])=[CH:4][N:3]=[C:2]([N:28]2[CH2:29][CH2:30][N:25]([CH3:24])[CH2:26][CH2:27]2)[CH:7]=1

참가 물질

6

반응물 4

HCID 6228DimethylformamideHCID 11430Potassium CarbonateHCID 531671-MethylpiperazineHCID 441196732-Chloro-4-methoxy-5-nitropyridine

생성물 1

HCID 867320291-(4-Methoxy-5-nitropyridin-2-yl)-4-methylpiperazine수율 99.8%

시약·촉매·용매 1

HCID 962Water용매

반응 조건

온도
60 °C

실험 절차

2-Chloro-4-methoxy-5-nitropyridine (Frontier Scientific, Newark, Del.; 1.02 g, 5.40 mmol) and K2CO3 (895 mg, 6.48 mmol) were purged with argon, treated with DMF (10 mL) followed by 1-methylpiperazine (0.66 mL, 5.94 mmol). The reaction mixture was then heated to 60° C. for 3 h. The reaction mixture was cooled to RT and treated with water, extracted with EtOAc (2×100 mL), washed with brine (2×25 mL) and dried over MgSO4, filtered and concentrated affording crude 1-(4-methoxy-5-nitropyridin-2-yl)-4-methylpiperazine (1.36 g, 5.39 mmol, 99% yield). m/z (ESI, +ve ion) 252.9 (M+H)+. 1H NMR (400 MHz, CDCl3) δ ppm 8.88 (1H, s), 5.97 (1H, s), 3.97 (3H, s), 3.70-3.78 (4H, m), 2.47-2.55 (4H, m), 2.36 (3H, s). Pd/C (10 wt. %, 586 mg, 0.55 mmol) and 1-(4-methoxy-5-nitropyridin-2-yl)-4-methylpiperazine (1.36 g, 5.39 mmol) were treated with EtOH (20 mL) and EtOAc (20 mL) and stirred at RT overnight (18 h) under an atmosphere of hydrogen (balloon). The reaction mixture was filtered through a pad of Celite, washed with MeOH, and concentrated to dryness affording 4-methoxy-6-(4-methylpiperazin-1-yl)pyridin-3-amine (8a) (1.22 g, 5.77 mmol, 99% yield) as a purple viscous oil. m/z (ESI, +ve ion) 223.1 (M+H)+. 1H NMR (400 MHz, CDCl3) δ ppm 7.67 (1H, s), 6.17 (1H, s), 3.87 (3H, s), 3.37-3.45 (4H, m), 3.32 (2H, br. s.), 2.51-2.60 (4H, m), 2.36 (3H, s).

후처리

  1. temperatureThe reaction mixture was cooled to RT
  2. extractionextracted with EtOAc (2×100 mL)
  3. washwashed with brine (2×25 mL)
  4. dry with materialdried over MgSO4
  5. filtrationfiltered
  6. concentrationconcentrated

출처 및 근거

ORD 기록
ord-f66da4f1025c4383ab7da0e24f52b27e
출처 데이터셋
uspto-grants-2016_05
특허 번호
US09346801B2

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