Hydrochloric Acid → 5-methyl-4-(1-methyl-1H-pyrazol-5-yl)-2-thiophenecarboxylic acid

HRID 1961189Notes

Reaction equation

[CH3:1][C:2]1[S:6][C:5]([C:7]([O:9]C)=[O:8])=[CH:4][C:3]=1[C:11]1[N:15]([CH3:16])[N:14]=[CH:13][CH:12]=1.[OH-].[Na+].Cl>O1CCCC1>[CH3:1][C:2]1[S:6][C:5]([C:7]([OH:9])=[O:8])=[CH:4][C:3]=1[C:11]1[N:15]([CH3:16])[N:14]=[CH:13][CH:12]=1

Participants

Conditions

Temperature: 70 °C

Procedure

To a 100 mL round-bottomed flask was added methyl 5-methyl-4-(1-methyl-1H-pyrazol-5-yl)-2-thiophenecarboxylate (1.34 g, 5.67 mmol) in Tetrahydrofuran (THF) (31 ml). 6N NaOH (31 ml, 186 mmol) was added and the reaction mixture stirred at 70° C. overnight. The reaction mixture was neutralized by slow addition of 6N HCl and partitioned between CHCl3 and H2O. The layers were separated, the organic layer dried with Na2SO4 and solvent removed. The resulting solid was used without further purification (0.71 g, 2.81 mmol, 96%): LC-MS (ES) m/z=223 (M+H)+.

Workup

custompartitioned between CHCl3 and H2O
customThe layers were separated
dry with materialthe organic layer dried with Na2SO4 and solvent
customremoved
customThe resulting solid was used without further purification (0.71 g, 2.81 mmol, 96%)

Sources & evidence

ORD record: ord-4799acd515db4f6994baaa41c4224382
Source dataset: uspto-grants-2013_04
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08410158B2

Reaction notes

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