Sodium Dithionite → Methyl 2-amino-5-(benzyloxy)-4-methoxybenzoate

HRID 1917818노트

반응식

HRID 1917818 반응식
[CH2:1]([O:8][C:9]1[C:10]([O:22][CH3:23])=[CH:11][C:12]([N+:19]([O-])=O)=[C:13]([CH:18]=1)[C:14]([O:16][CH3:17])=[O:15])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[O-]S(S([O-])=O)=O.[Na+].[Na+]>CO.O>[NH2:19][C:12]1[CH:11]=[C:10]([O:22][CH3:23])[C:9]([O:8][CH2:1][C:2]2[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=2)=[CH:18][C:13]=1[C:14]([O:16][CH3:17])=[O:15]

참가 물질

5

반응물 2

HCID 24489Sodium DithioniteHCID 22667156Methyl 5-Benzyloxy-4-methoxy-2-nitrobenzoate

생성물 1

HCID 22667093Methyl 2-amino-5-(benzyloxy)-4-methoxybenzoate

시약·촉매·용매 2

HCID 887Methanol용매HCID 962Water용매

실험 절차

To a solution of methyl 5-(benzyloxy)-4-methoxy-2-nitrobenzoate (13.48 g, 0.0425 mol) in MeOH (700 mL) at 55° C., a concentrated solution of Na2S2O4 in water was added slowly until no more starting material was observed on TLC. The heterogeneous solution was concentrated under vacuum. The residue was treated with water (100 ml) and the mixture extracted with ethyl acetate (2×200 mL). The combined organic layers were washed with water and brine. After drying over MgSO4, the solvent was evaporated and the residue was purified on silica gel column, using ethyl acetate/DCM (1/9) as eluent to yield methyl 2-amino-5-(benzyloxy)-4-methoxybenzoate. Yield: 7.36 g (60%). 1HNMR (DMSO-d6): δ 7.34 (5H, m), 7.25 (1H, s), 6.48 (2H, s), 6.39 (1H, s), 4.91 (2H, s), 3.80 (3H, s), 3.73 (3H, s). LC-MS (ESI) m/z 288 (M+H)+.

후처리

  1. concentrationThe heterogeneous solution was concentrated under vacuum
  2. additionThe residue was treated with water (100 ml)
  3. extractionthe mixture extracted with ethyl acetate (2×200 mL)
  4. washThe combined organic layers were washed with water and brine
  5. dry with materialAfter drying over MgSO4
  6. customthe solvent was evaporated
  7. customthe residue was purified on silica gel column

출처 및 근거

ORD 기록
ord-8839505dd9f548ec81742df3191259ad
출처 데이터셋
uspto-grants-2013_12
특허 번호
US08618289B2

반응 노트

불러오는 중…