Methyl Acrylate → methyl 5-[(1E)-3-methoxy-3-oxoprop-1-en-1-yl]-2,3-dimethyl-2H-indazole-4-carboxylate

HRID 887743Notes

Reaction equation

Br[C:2]1[CH:10]=[CH:9][C:8]2[C:4](=[C:5]([CH3:12])[N:6]([CH3:11])[N:7]=2)[C:3]=1[C:13]([O:15][CH3:16])=[O:14].C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.C(=O)([O-])[O-].[K+].[K+].[C:42]([O:46][CH3:47])(=[O:45])[CH:43]=[CH2:44]>CN(C)C=O.C([O-])(=O)C.[Pd+2].C([O-])(=O)C>[CH3:47][O:46][C:42](=[O:45])/[CH:43]=[CH:44]/[C:2]1[CH:10]=[CH:9][C:8]2[C:4](=[C:5]([CH3:12])[N:6]([CH3:11])[N:7]=2)[C:3]=1[C:13]([O:15][CH3:16])=[O:14]

Participants

Conditions

Temperature: 100 °C

Procedure

A suspension of methyl 5-bromo-2,3-dimethyl-2H-indazole-4-carboxylate (1.10 g, 3.89 mmol), palladium acetate (87.3 mg, 0.389 mmol), triphenylphosphine (204 mg, 0.778 mmol), potassium carbonate (591 mg, 4.28 mmol) and methyl acrylate (523 μL, 5.83 mmol) in N,N-dimethylformamide (39 mL) was stirred with heating at 100° C. for 4 hr. The solvent was evaporated under reduced pressure, and the residue was diluted with ethyl acetate, washed with water and saturated brine, and dried over anhydrous sodium sulfate. The solvent was evaporated under reduced pressure, and the residue was purified by silica gel column chromatography (ethyl acetate/hexane=20/80→60/40) to give the title compound (606 mg, yield 54%).

Workup

customThe solvent was evaporated under reduced pressure
additionthe residue was diluted with ethyl acetate
washwashed with water and saturated brine
dry with materialdried over anhydrous sodium sulfate
customThe solvent was evaporated under reduced pressure
customthe residue was purified by silica gel column chromatography (ethyl acetate/hexane=20/80→60/40)

Sources & evidence

ORD record: ord-d52c718ca2c54ec29bb58f1d9ec8f53d
Source dataset: uspto-grants-2012_08
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08247429B2

Reaction notes

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