反应详情

2-Cyano-N-phenylacetamide (820 mg) in THF (20 mL) was treated with LDA (4.4 mL, 1.8M solution in heptane/THF/ethylbenzene) at −78° C. for 1 h, before (E)-tert-butyl-3-((dimethylamino)methylene)-4-oxopiperidine-1-carboxylate (1 g) was added. The reaction mixture was allowed to warm to room temperature, and quenched with saturated NaHCO3 aqueous solution (20 mL). The aqueous solution was extracted with EtOAc (3×20 mL) and the combined organic layer was dried over MgSO4. Concentration under vacuum provided a residue which was purified by HPLC to afford tert-butyl 3-cyano-2-oxo-1-phenyl-1,2,7,8-tetrahydro-1,6-naphthyridine-6(5H)-carboxylate. LCMS: m/z 352.2 (M+H)+, 1.63 min (method 8). 1H NMR (500 MHz, DMSO-d6) δ ppm 8.19 (s, 1H) 7.48-7.57 (m, 3H) 7.33 (d, J=7.02 Hz, 2H) 4.33 (s, 2H) 3.44 (t, J=5.65 Hz, 2H) 2.19 (t, J=5.80 Hz, 2H) 1.39 (s, 9H).

1. additionwas added
2. customquenched with saturated NaHCO3 aqueous solution (20 mL)
3. extractionThe aqueous solution was extracted with EtOAc (3×20 mL)
4. dry with materialthe combined organic layer was dried over MgSO4
5. concentrationConcentration under vacuum
6. customprovided a residue which
7. customwas purified by HPLC