2-Methyl-2-butene → 6-(3-Acetoxy-propoxy)-7-methoxy-1-(3-methoxy-benzoyl)-isoquinoline-4-carboxylic acid

HRID 1833172Notes

Reaction equation

HRID 1833172 reaction equation
[C:1]([O:4][CH2:5][CH2:6][CH2:7][O:8][C:9]1[CH:10]=[C:11]2[C:16](=[CH:17][C:18]=1[O:19][CH3:20])[C:15]([C:21](=[O:30])[C:22]1[CH:27]=[CH:26][CH:25]=[C:24]([O:28][CH3:29])[CH:23]=1)=[N:14][CH:13]=[C:12]2[CH:31]=[O:32])(=[O:3])[CH3:2].O.P([O-])(O)(O)=[O:35].[Na+].CC(=CC)C.Cl([O-])=O.[Na+]>C(O)(C)(C)C.O.CCCCCC>[C:1]([O:4][CH2:5][CH2:6][CH2:7][O:8][C:9]1[CH:10]=[C:11]2[C:16](=[CH:17][C:18]=1[O:19][CH3:20])[C:15]([C:21](=[O:30])[C:22]1[CH:27]=[CH:26][CH:25]=[C:24]([O:28][CH3:29])[CH:23]=1)=[N:14][CH:13]=[C:12]2[C:31]([OH:35])=[O:32])(=[O:3])[CH3:2]

Participants

8

Reactant 4

HCID 105532-Methyl-2-buteneHCID 516949Sodium Phosphate, Monobasic, MonohydrateHCID 220483966-(3-Acetoxy-propoxy)-7-methoxy-1-(3-methoxy-benzoyl)-isoquinoline-4-carbaldehydeHCID 23668197Sodium Chlorite

Product 1

HCID 113968366-(3-Acetoxy-propoxy)-7-methoxy-1-(3-methoxy-benzoyl)-isoquinoline-4-carboxylic acidYield 39.2%

Reagents, catalysts & solvents 3

HCID 962WaterSolventHCID 6386tert-ButanolSolventHCID 8058HexaneSolvent

Procedure

To a stirred solution of afforded 6-(3-acetoxy-propoxy)-7-methoxy-1-(3-methoxy-benzoyl)-isoquinoline-4-carbaldehyde (20 mg, 0.045 mmol) in t-butanol (1 mL) and water (1 mL) solution was added sodium dihydrogenphosphate monohydrate (25.3 mg, 0.18 mmol), 2-methyl-2-butene (0.030 mL, 0.27 mmol) and sodium chlorite (24.8 mg, 0.27 mmol) at room temperature. The reaction suspension was then stirred at room temperature for 14 hrs. The resulting two-phase mixture was partitioned between dichloromethane and water and acidified to pH=3 by addition of acetic acid. The aqueous phase was then extracted with dichloromethane (3×20 mL). The combined extracts were washed with saturated aqueous sodium chloride solution (30 mL), dried over anhydrous magnesium sulfate, filtered and concentrated in vacuo to afford a brown semi-solid oil. The crude product was recrystallized in ethyl acetate and hexane to afford 6-(3-acetoxy-propoxy)-7-methoxy-1-(3-methoxy-benzoyl)-isoquinoline-4-carboxylic acid (8.0 mg, 39% yield) as a white solid: HR-MS m/e calcd for C24H23N1O8 (M−H+) 454.1496, found 454.1502; 1H NMR (300 MHz) compatible.

Workup

  1. customThe resulting two-phase mixture was partitioned between dichloromethane and water
  2. additionacidified to pH=3 by addition of acetic acid
  3. extractionThe aqueous phase was then extracted with dichloromethane (3×20 mL)
  4. washThe combined extracts were washed with saturated aqueous sodium chloride solution (30 mL)
  5. dry with materialdried over anhydrous magnesium sulfate
  6. filtrationfiltered
  7. concentrationconcentrated in vacuo
  8. customto afford a brown semi-solid oil
  9. customThe crude product was recrystallized in ethyl acetate

Sources & evidence

ORD record
ord-f6eaa7985fa54524a4c3bd23bf4f8bfe
Source dataset
uspto-grants-2006_06
Patent number
US07067529B2

Reaction notes

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