反应详情

A suspension of 7-nitro-3,4-dihydroisoquinoline (13.4 g, 76.1 mmol) and cyanoacetic acid (12.5 g, 150 mmol) in acetic acid (55 ml) was heated at reflux for 0.5 h. After evolution of carbon dioxide had ceased and the reaction mixture had cooled, the solvent was removed on the rotoevaporator. The residue was triturated with isopropanol (100 ml) and the solid was collected. The crude product was partitioned between ethyl acetate and dilute potassium carbonate solution. The dried (MgSO4) organic phase was concentrated to give the title compound as an orange solid (12.6 g, 76%), MS 218 (M+H)+. 1H NMR (CDCl3) 8.03 (dd, 1H), 7.99 (d, 1H), 7.31 (d, 1H), 4.45 (t, 1H), 3.1-3.4 (m, 3H), 2.9-3.0 (m, 3H), 2.07 (broad s, 1H).

1. temperaturewas heated
2. temperatureat reflux for 0.5 h
3. temperaturethe reaction mixture had cooled
4. customthe solvent was removed on the rotoevaporator
5. customThe residue was triturated with isopropanol (100 ml)
6. customthe solid was collected
7. customThe crude product was partitioned between ethyl acetate and dilute potassium carbonate solution
8. dry with materialThe dried (MgSO4) organic phase
9. concentrationwas concentrated