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

HRID 884848

Reaction equation

[Br: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>[Br: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 0.29 g of 3-bromo-N-[2-hydroxy-5-(trifluoromethyl)phenyl]isonicotinamide, 4 ml of tetrahydrofuran and 0.25 g of triphenylphosphine, 0.42 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 0.24 g of 2-(3-bromopyridin-4-yl)-5-(trifluoromethyl)benzoxazole (hereinafter, referred to as “active compound 27”).

Workup

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

Sources & evidence

ORD record: ord-b05badc6d13144ecb3eb9b1b6f6f9511
Source dataset: uspto-grants-2012_08
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08242133B2

Linked notes

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