Water → HCID 67136016, compound

Participants

Reaction Steps

5-(2,6-Difluoro-4-nitrophenoxy)-1,3-dimethyl-4-(2,4,6-trifluorophenyl)-1H-pyrazole (i.e. the product of Synthesis Example 8) (0.780 g, 1.95 mmol) was combined with iron powder (325 mesh, 0.58 g, 10 mmol) and ammonium chloride (64 mg, 1.2 mmol) in ethanol (27 mL) to which water (3 mL) had been added. The mixture was heated at reflux for 1.25 h and then allowed to cool. The reaction mixture was diluted with an equal volume of ethyl acetate and filtered through Celite filter aid. The filtrate was dried with MgSO4 and concentrated. Analysis by LC/MS showed the major component (93%) to have mass 370 amu (AP+). The residue was dissolved in anhydrous dimethyl sulfoxide (8 mL), and a commercial solution of sodium methoxide in methanol (0.45 mL of 25% solution) was added. This solution was stirred under nitrogen and heated at reflux for 1 h. Additional sodium methoxide/methanol solution (0.20 mL) was added, and heating was continued for an additional 30 minutes. The reaction mixture was allowed to cool, and it was then treated with aqueous citric acid solution (1 M, 5 mL), diluted with water (50 mL) and extracted with ethyl acetate (2×25 mL). The organic phase was washed with water (3×) and with brine, dried over MgSO4, and concentrated to leave the title product, a compound of the present invention, as a viscous oil (0.52 g).

Provenance & Evidence