Tetrahydrofuran → 2-(3-Fluoropyridin-4-yl)-5-(trifluoromethyl)benzoxazole

HRID 2190721Notes

Reaction equation

[F:1][C:2]1[CH:21]=[N:20][CH:19]=[CH:18][C:3]=1[C:4]([NH:6][C:7]1[CH:12]=[C:11]([C:13]([F:16])([F:15])[F:14])[CH:10]=[CH:9][C:8]=1[OH:17])=O.O1CCCC1.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.N(C(OCC)=O)=NC(OCC)=O>C1(C)C=CC=CC=1>[F:1][C:2]1[CH:21]=[N:20][CH:19]=[CH:18][C:3]=1[C:4]1[O:17][C:8]2[CH:9]=[CH:10][C:11]([C:13]([F:16])([F:15])[F:14])=[CH:12][C:7]=2[N:6]=1

Participants

Conditions

Temperature: 50 °C

Procedure

To a mixture of 0.51 g of 3-fluoro-N-[2-hydroxy-5-(trifluoromethyl)phenyl]isonicotinamide, 5 ml of tetrahydrofuran and 0.53 g of triphenylphosphine, 0.89 g of 40% toluene solution of diethyl azodicarboxylate was added dropwise at room temperature. The reaction mixture was stirred while heating at 50° C. for 1.5 hours. The reaction mixture was cooled to room temperature, and then concentrated under reduced pressure. The residue was subjected to silica gel column chromatography to give 0.46 g of 2-(3-fluoropyridin-4-yl)-5-(trifluoromethyl)benzoxazole (hereinafter, referred to as “active compound 25”).

Workup

additionwas added dropwise at room temperature
temperatureThe reaction mixture was cooled to room temperature
concentrationconcentrated under reduced pressure

Sources & evidence

ORD record: ord-19522329e2b8471f85745ef9e1cc3f3d
Source dataset: uspto-grants-2012_12
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08324387B2

Reaction notes

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