Sulfuric Acid → 2-Ethylhexyl 4-amino-3,6-dichloropyridine-2-carboxylate

反応式

[CH2:1]([CH:3]([CH2:6][CH2:7][CH2:8][CH3:9])[CH2:4][OH:5])[CH3:2].S(=O)(=O)(O)O.[NH2:15][C:16]1[CH:21]=[C:20]([Cl:22])[N:19]=[C:18]([C:23](O)=[O:24])[C:17]=1[Cl:26]>O>[NH2:15][C:16]1[CH:21]=[C:20]([Cl:22])[N:19]=[C:18]([C:23]([O:5][CH2:4][CH:3]([CH2:1][CH3:2])[CH2:6][CH2:7][CH2:8][CH3:9])=[O:24])[C:17]=1[Cl:26]

参加物

実験手順

To a solution of 2-ethylhexanol (10 mL) and sulfuric acid (1 mL) was added 4-amino-3,6-dichloro-pyridine-2-carboxylic acid (0.0097 mol, 2.0 g). After heating the reaction to reflux overnight, the reaction mixture was cooled, poured into water (75 mL), and extracted with ethyl acetate (75 mL). The organic phase was washed with sodium bicarbonate (75 mL), dried (Na2SO4), and concentrated. The resulting solid was recrystallized out of dichloromethane and hexane and filtered to give 2-ethylhexyl 4-amino-3,6-dichloropyridine-2-carboxylate (0.0074 mol, 2.36 g) as a crystalline solid (mp 55° C.). 1H NMR (CDCl3): δ 0.9 (7 H, m), 1.3 (7 H, m), 1.7 (1 H, m), 4.3 (2 H, d), 5.1 (2 H, bs), 6.7 (1 H, s).