Tetrahydrofuran → 6-Chloro-2-(3-chloropyridin-4-yl)-5-(trifluoromethyl)benzoxazole

HRID 884893Notes

Reaction equation

HRID 884893 reaction equation
[Cl:1][C:2]1[CH:22]=[N:21][CH:20]=[CH:19][C:3]=1[C:4]([NH:6][C:7]1[CH:12]=[C:11]([C:13]([F:16])([F:15])[F:14])[C:10]([Cl:17])=[CH:9][C:8]=1[OH:18])=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>[Cl:17][C:10]1[C:11]([C:13]([F:16])([F:15])[F:14])=[CH:12][C:7]2[N:6]=[C:4]([C:3]3[CH:19]=[CH:20][N:21]=[CH:22][C:2]=3[Cl:1])[O:18][C:8]=2[CH:9]=1

Participants

6

Reactant 4

HCID 8028TetrahydrofuranHCID 11776TriphenylphosphineHCID 220568ethyl N-ethoxycarbonyliminocarbamateHCID 668805073-chloro-N-[4-chloro-2-hydroxy-5-trifluoromethylphenyl]isonicotinamide

Product 1

HCID 668804856-Chloro-2-(3-chloropyridin-4-yl)-5-(trifluoromethyl)benzoxazoleYield 89.4%

Reagents, catalysts & solvents 1

HCID 1140TolueneSolvent

Procedure

To a mixture of 0.46 g of 3-chloro-N-[4-chloro-2-hydroxy-5-(trifluoromethyl)phenyl]isonicotinamide, 5 ml of tetrahydrofuran and 0.38 g of triphenylphosphine, 0.63 g of 40% toluene solution of diethyl azodicarboxylate was added dropwise at room temperature, and the reaction mixture was stirred for two hours. The reaction mixture was concentrated under reduced pressure. The residue was subjected to silica gel column chromatography to give 0.39 g of 6-chloro-2-(3-chloropyridin-4-yl)-5-(trifluoromethyl)benzoxazole (hereinafter, referred to as “active compound 81”).

Workup

  1. additionwas added dropwise at room temperature
  2. concentrationThe reaction mixture was concentrated under reduced pressure

Sources & evidence

ORD record
ord-e1458eb80e2d4054be36f5b344921ea3
Source dataset
uspto-grants-2012_08
Patent number
US08242133B2

Reaction notes

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