Diazoacetophenone → Ethyl 4-(4-chloro-2-nitrobenzoyl)-3-benzoyl-1H-pyrazole-5-carboxylate

Participants

Reaction Steps

A solution of ethyl 4-(4-chloro-2-nitrophenyl)-4-oxo-2-butynoate (prepared as described in Example 48(a)) (1.2 g, 4.11 mmol) and diazoacetophenone (1.2 g 8.22 mmol, prepared as described in Org. Syn. Coll. Vol. VI. pp. 386-388) in tetrahydrofiuran (THF) (21.6 mL) was stirred at room temperature for 16 hours. The reaction was concentrated by rotary evaporation and purified by flash chromatography eluting with hexanes:ethyl acetate (90:10, 80:20, 70:30) to give the title compound (1.3 g, 74.3%); Rf 0.38 (1:1 ethyl acetate:hexanes).

Provenance & Evidence