反应详情

Reflux a mixture of cyclopentanone (600 g, 7.14 mol), pyrrolidine (550 g, 4.68 mol) and toluene-4-sulfonic acid (5.0 g) in toluene (3 L) for 4 hours. After removal of solvent under vacuum, purify the residue by distillation carefully to give 1-cyclopent-1-enyl-pyrrolidine as colorless oil (898 g, 6.55 mol, 91.8%). 1H NMR (CDCl3, 400 MHz): δ 4.04 (m, 1H), 3.06 (m, 4H), 2.39 (m, 4H), 1.85 (m, 6H).

1. temperatureReflux
2. customAfter removal of solvent under vacuum
3. custompurify the residue
4. distillationby distillation carefully