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

반응식

[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]

참가 물질

실험 절차

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).