反应详情

温度

50 °C

Ethyl 2-oxo-5-vinylcyclopentanecarboxylate (0.48 g, 2.79 mmol) was mixed with ammonium acetate (2.15 g, 27.9 mmol) in MeOH (10 mL). The mixture was heated to 50° C. for 2 hours. The contents were concentrated. The residue was partitioned between DCM and water. The DCM layer was separated, and the aqueous layer was extracted with DCM. The combined DCM solutions were dried (Na2SO4). The crude was purified with flash chromatography to give ethyl 2-amino-5-vinylcyclopent-1-enecarboxylate (0.19 g, 41% for 2 steps). 1H NMR (CDCl3, 400 MHz) δ (ppm): 5.59-5.58 (m, 1H), 5.05-4.88 (m, 2H), 3.68 (s, 3H), 3.52-3.46 (m, 1H), 2.66-2.56 m, 1H), 2.38-2.30 (m, 1H), 2.13-2.03 (m, 1H), 1.70-1.62 (m, 1H), 1.61 (br s, 2H). MS: 168.0 (M+1).

1. concentrationThe contents were concentrated
2. customThe residue was partitioned between DCM and water
3. customThe DCM layer was separated
4. extractionthe aqueous layer was extracted with DCM
5. dry with materialThe combined DCM solutions were dried (Na2SO4)
6. customThe crude was purified with flash chromatography