1H-Indazole-3-carboxylic acid, 1-methyl- → 1-(1-Methyl-1H-indazol-3-yl)ethan-1-one

HRID 2073520Notes

Reaction equation

HRID 2073520 reaction equation
[CH3:1][Li].[CH3:3][N:4]1[C:12]2[C:7](=[CH:8][CH:9]=[CH:10][CH:11]=2)[C:6]([C:13]([OH:15])=O)=[N:5]1>C1COCC1>[CH3:3][N:4]1[C:12]2[C:7](=[CH:8][CH:9]=[CH:10][CH:11]=2)[C:6]([C:13](=[O:15])[CH3:1])=[N:5]1

Participants

4

Reactant 2

HCID 6891051H-Indazole-3-carboxylic acid, 1-methyl-HCID 178418348HCID 178418348, compound

Product 1

HCID 124552841-(1-Methyl-1H-indazol-3-yl)ethan-1-one

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Procedure

Methyl lithium (1.58M solution in ether; 13.8 ml) was added dropwise to a stirred, cold (-60°) solution of 1-methyl-1H-indazole-3-carboxylic acid (1.77 g) in dry THF (60 ml) under nitrogen and stirring was continued while warming to 0° over 2 h. The reaction mixture was quenched with saturated ammonium chloride solution (50 ml), and the layers were separated. The aqueous layer was further extracted with dichloromethane (2×50 ml) and the combined organic layers were washed with brine (2×50 ml), dried and evaporated in vacuo. The residual solid (1.8 g) was purified by FCC eluting with System B (1:4) to give the title compound (1.3 g), m.p. 86°-88°.

Workup

  1. temperaturewhile warming to 0° over 2 h
  2. customThe reaction mixture was quenched with saturated ammonium chloride solution (50 ml)
  3. customthe layers were separated
  4. extractionThe aqueous layer was further extracted with dichloromethane (2×50 ml)
  5. washthe combined organic layers were washed with brine (2×50 ml)
  6. customdried
  7. customevaporated in vacuo
  8. customThe residual solid (1.8 g) was purified by FCC
  9. washeluting with System B (1:4)

Sources & evidence

ORD record
ord-1ea53b600f1343cea0ebf2a0544dcd5d
Source dataset
uspto-grants-1990_04
Patent number
US04918080

Reaction notes

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