Hydrochloric Acid → 1-[4-(2-phenyl-4-thiazolylmethoxy)benzyl]-3-(2-thienyl)-1H-pyrazole-4-carboxylic acid

HRID 350328Notes

Reaction equation

[C:1]1([C:7]2[S:8][CH:9]=[C:10]([CH2:12][O:13][C:14]3[CH:35]=[CH:34][C:17]([CH2:18][N:19]4[CH:23]=[C:22]([C:24]([O:26]CC)=[O:25])[C:21]([C:29]5[S:30][CH:31]=[CH:32][CH:33]=5)=[N:20]4)=[CH:16][CH:15]=3)[N:11]=2)[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1.[OH-].[Na+].O1CCCC1.Cl>C(O)C>[C:1]1([C:7]2[S:8][CH:9]=[C:10]([CH2:12][O:13][C:14]3[CH:35]=[CH:34][C:17]([CH2:18][N:19]4[CH:23]=[C:22]([C:24]([OH:26])=[O:25])[C:21]([C:29]5[S:30][CH:31]=[CH:32][CH:33]=5)=[N:20]4)=[CH:16][CH:15]=3)[N:11]=2)[CH:2]=[CH:3][CH:4]=[CH:5][CH:6]=1

Participants

Conditions

Temperature: 80 °C

Procedure

A mixture of ethyl 1-[4-(2-phenyl-4-thiazolylmethoxy)benzyl]-3-(2-thienyl)-1H-pyrazole-4-carboxylate (750 mg), 1N aqueous sodium hydroxide solution (3 ml), tetrahydrofuran (5 ml), and ethanol (5 ml) was stirred at 80° C. for 5 hours. After cooling, 1N hydrochloric acid (3 ml) was added to the mixture and the mixture was extracted with ethyl acetate. The ethyl acetate layer was washed with saturated aqueous sodium chloride solution, dried (MgSO4), and concentrated. The resulting colorless crystals were collected by filtration to obtain 1-[4-(2-phenyl-4-thiazolylmethoxy)benzyl]-3-(2-thienyl)-1H-pyrazole-4-carboxylic acid (640 mg, yield: 90%). This was recrystallized from acetone-hexane. Melting point: 187˜188° C.

Workup

temperatureAfter cooling
extractionthe mixture was extracted with ethyl acetate
washThe ethyl acetate layer was washed with saturated aqueous sodium chloride solution
dry with materialdried (MgSO4)
concentrationconcentrated
filtrationThe resulting colorless crystals were collected by filtration

Sources & evidence

ORD record: ord-39cb42de04604824bb701b0e808fda20
Source dataset: uspto-grants-2007_02
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07179823B1

Reaction notes

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