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A mixture of crude β-N,N-dimethylaminoethenylcyclopropyl ketone (17-2; 12 g, <86 mmol), nitroacetamide (9 g, 86 mmol) and aqueous piperidinium acetate (10 ml) [prepared from glacial acetic acid (42 ml), water (100 ml) and piperidine (72 ml)] was stirred at room temperature overnight. Following dilution with water (20 ml), the yellow precipitate was isolated via filtration and drying in vacuo to yield the title compound 17-3: 1H NMR (CDCl3) δ 1.15 (m, 2H), 1.36 (m, 2H), 2.10 (m, 1H), 6.02 (br d, J=8.0 Hz, 1H), 8.41 (d, J=8.0 Hz, 1H).

1. customthe yellow precipitate was isolated via filtration
2. customdrying in vacuo