Hydrochloric Acid → 3-[(4,4,4-Trifluoro-3-oxo-1-butenyl)amino]-2-propenenitrile

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Reaction Steps

Sodium hydride (60% dispersion in mineral oil, 400 mg, 10 mmol) was charged and washed with hexane twice. Into this flask, N,N-dimethylformamide (10 ml) was added and then a solution prepared by dissolving 4-amino-1,1,1-trifluoro-3-buten-2-one (1.4 g, 10 mmol) and 3-methoxyacrylonitrile (830 mg, 10 mmol) in N,N-dimethylformamide (5 ml) was added dropwise under ice-cooling. After stirring the mixture at room temperature for 3 hours, the reaction mixture was poured into water (50 ml). This mixture was acidified with concentrated hydrochloric acid under ice-cooling, and then extracted with ethyl acetate. The organic layers were combined, washed with brine, dried over magnesium sulfate and then concentrated under reduced pressure. The resulting residue was purified by silica gel column chromatography (an eluting solvent: hexane/ethyl acetate=3/1 to 1/1) to obtain 993 mg (yield 52.3%) of title compound (IIa) having a low polarity and 457 mg (yield 24.0%) of title compound (IIb) having a high polarity.

Provenance & Evidence