反应详情

温度

140 °C

N-(2-Aminoethyl)piperidine (2.11 g) was added to cis-4-cyclohexene-1,2-dicarboxylic anhydride (2.50 g) and stirred for 6 hours at 140° C. The reaction mixture was suspended into a mixed solution of 2-propanol (125 ml) and water (21 ml) and then sodium borohydride (3.12 g) was added thereto at room temperature. After being stirred for 68 hours at room temperature, the reaction mixture was acidified with dilute hydrochloric acid and then concentrated. The residue was adjusted to pH 9 with saturated sodium hydrogencarbonate aqueous solution and 1N sodium hydroxide, and then extracted with ethyl acetate. The extract was washed with saturated brine, dried over sodium sulfate anhydride, and concentrated, thereby yielding a crude (3.34 g) containing the entitled compound as brown syrup.

1. customat room temperature
2. stirringAfter being stirred for 68 hours at room temperature
3. concentrationconcentrated
4. extractionextracted with ethyl acetate
5. washThe extract was washed with saturated brine
6. dry with materialdried over sodium sulfate anhydride
7. concentrationconcentrated
8. customyielding a crude (3.34 g)