Nitromethane → HCID 45357900、化合物
反応式
[CH3:1][O:2][C:3](=[O:12])[C:4]([C:10]#[N:11])=[CH:5][CH2:6][CH:7]([CH3:9])[CH3:8].[N+]([CH3:16])([O-])=O>C(#N)C>[CH3:1][O:2][C:3]([C:4]1([C:10]#[N:11])[CH2:16][CH:5]1[CH2:6][CH:7]([CH3:9])[CH3:8])=[O:12]参加物
4
実験手順
To a solution of 2-cyano-5 methyl-hex-2-enoic acid methyl ester (20.2 g, 121 mmol) in dry acetonitrile (110 mL) was added nitromethane (9.8 mL, 181 mmol) and a portionwise addition of alumina-supported potassium flouride (40% wt, 39.3 g). The reaction mixture was stirred under reflux for 2 hours and cooled to room temperature. The solid was removed by filtration through a short pad of celite and washed with acetonitrile. Excess of solvent was removed in vacuo and the residue was re-dissolved in ether. The ether layer was washed with water, brine, dried (Na2SO4) and concentrated in vacuo. The crude product was purified by flash column chromatography using hexanes/EtOAc (8:2) as an eluent to give 15 g (69%) of 1-cyano-2-isobutyl-cyclopropanecarboxylic acid methyl ester as colorless oil: 1H NMR (300 MHz, CDCl3) δ 0.98 (d, J=2.9 Hz, 3H), 1.00 (d, J=3.0 Hz, 3H), 1.35–1.42 (m, 2H), 1.65 (m, 1H), 1.79–1.94 (m, 3H), 3.81 (s, 3H); 13C NMR (75 MHz, CDCl3) δ 19.3, 22.3, 22.4, 25.5, 27.9, 30.1, 39.0, 53.4, 117.3, 168.5.