Hydrochloric Acid → HCID 57687728, compound

Participants

Reaction Conditions

Reaction Steps

A solution of ethyl 1-[(4-methylphenyl)sulfonyl]-5-phenyl-1H-pyrazole-3-carboxylate (700 mg) in tetrahydrofuran (10 mL) was cooled to −78° C., and a 1.5 mol/L solution (3.8 mL) of diisobutylaluminum hydride in toluene was added dropwise. After the completion of the dropwise addition, the mixture was stirred at −78° C. for 30 min. 1 mol/L Hydrochloric acid was added, and the mixture was extracted with ethyl acetate. The extract was washed with saturated brine, dried over anhydrous sodium sulfate, and concentrated under reduced pressure. To a solution of the residue in acetonitrile (15 mL) were added tetra-n-propylammonium perruthenate (66 mg), N-methylmorpholine N-oxide (442 mg) and molecular sieves 4 A powder (1.0 g), and the mixture was stirred at room temperature for 1 hr. The reaction mixture was concentrated under reduced pressure, and the residue was suspended in ethyl acetate and filtered through celite. The filtrate was concentrated under reduced pressure, and the residue was purified by silica gel column chromatography (eluent:hexane-ethyl acetate=9:1→2:1) to give the title compound as a pale-yellow solid (yield 224 mg, 36%).

Provenance & Evidence