Sodium Hydroxide → 4-(1,4-dimethyl-1H-pyrazol-5-yl)-5-methyl-2-thiophenecarboxylic acid

HRID 2392050Notes

Reaction equation

HRID 2392050 reaction equation
[CH3:1][N:2]1[C:6]([C:7]2[CH:8]=[C:9]([C:13]([O:15]C)=[O:14])[S:10][C:11]=2[CH3:12])=[C:5]([CH3:17])[CH:4]=[N:3]1.[OH-].[Na+]>O1CCCC1>[CH3:1][N:2]1[C:6]([C:7]2[CH:8]=[C:9]([C:13]([OH:15])=[O:14])[S:10][C:11]=2[CH3:12])=[C:5]([CH3:17])[CH:4]=[N:3]1

Participants

4

Reactant 2

HCID 14798Sodium HydroxideHCID 57826452methyl 4-(1,4-dimethyl-1H-pyrazol-5-yl)-5-methyl-2-thiophenecarboxylate

Product 1

HCID 578266574-(1,4-dimethyl-1H-pyrazol-5-yl)-5-methyl-2-thiophenecarboxylic acidYield 96%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Procedure

A solution of methyl 4-(1,4-dimethyl-1H-pyrazol-5-yl)-5-methyl-2-thiophenecarboxylate (240 mg, 0.96 mmol) in 6N sodium hydroxide (3.20 ml, 19.18 mmol) and tetrahydrofuran (4.79 ml) was stirred at 70° C. in a sealed tube for 1 h. The resulting solution was cooled and then partitioned between H2O-DCM. The aqueous phase was adjusted to pH ˜4 and then washed several times with DCM. The combined organic fractions were dried over Na2SO4 and concentrated affording 4-(1,4-dimethyl-1H-pyrazol-5-yl)-5-methyl-2-thiophenecarboxylic acid (217 mg, 0.92 mmol, 96% yield) as a yellow oil: LCMS (ES) m/e 236 (M+H)+.

Workup

  1. temperatureThe resulting solution was cooled
  2. custompartitioned between H2O-DCM
  3. washwashed several times with DCM
  4. dry with materialThe combined organic fractions were dried over Na2SO4
  5. concentrationconcentrated

Sources & evidence

ORD record
ord-86b7523267d14fc1a4360182704a3d80
Source dataset
uspto-grants-2012_09
Patent number
US08273782B2

Reaction notes

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