Water → ethyl 1-({5-[3-(trifluoromethyl)phenyl]-1,2,4-oxadiazol-3-yl}methyl)-1H-pyrazole-4-carboxylate

HRID 1257417Notes

Reaction equation

[NH2:1]/[C:2](=[N:14]\[OH:15])/[CH2:3][N:4]1[CH:8]=[C:7]([C:9]([O:11][CH2:12][CH3:13])=[O:10])[CH:6]=[N:5]1.[F:16][C:17]([F:28])([F:27])[C:18]1[CH:19]=[C:20]([CH:24]=[CH:25][CH:26]=1)[C:21](Cl)=O.O>N1C=CC=CC=1>[F:16][C:17]([F:27])([F:28])[C:18]1[CH:19]=[C:20]([C:21]2[O:15][N:14]=[C:2]([CH2:3][N:4]3[CH:8]=[C:7]([C:9]([O:11][CH2:12][CH3:13])=[O:10])[CH:6]=[N:5]3)[N:1]=2)[CH:24]=[CH:25][CH:26]=1

Participants

Conditions

Temperature: 115 °C

Procedure

A solution of the compound (2.2 g) obtained in Example 114a in pyridine (40 mL) was cooled in an ice bath and 3-(trifluoromethyl)benzoyl chloride (4.16 g) was added. The reaction mixture was heated to 110-120° C. overnight, cooled to room temperature, and poured into water. The mixture was extracted with ethyl acetate. The ethyl acetate layer was separated, washed successively with 1N aqueous hydrochloric acid solution, and saturated aqueous sodium hydrogen carbonate, dried over sodium sulfate, and concentrated under reduced pressure. The residue was purified by column chromatography (carrier: silica gel, eluent: hexane-petroleum ether) to give the title compound (0.85 g) as a colorless solid.

Workup

temperaturecooled to room temperature
extractionThe mixture was extracted with ethyl acetate
customThe ethyl acetate layer was separated
washwashed successively with 1N aqueous hydrochloric acid solution, and saturated aqueous sodium hydrogen carbonate
dry with materialdried over sodium sulfate
concentrationconcentrated under reduced pressure
customThe residue was purified by column chromatography (carrier: silica gel, eluent: hexane-petroleum ether)

Sources & evidence

ORD record: ord-6e47c27f1a0e4e3699b0f8edf3979550
Source dataset: uspto-grants-2013_06
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08461348B2

Reaction notes

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