Water → HCID 20634147, compound

Participants

Reaction Steps

To a bright yellow suspension of ethyl 1-(2,2-dicarboethoxyvinyl)-4-oxo-4H-quinolizine-3-carboxylate (12) (750 mg, 1.94 mmol) in 5 ml ethanol was added NaBH3CN (68 mg, 1.08 mmol). The reaction mixture turned red and all solid material dissolved. Stirring was continued for 1 h, and the reaction mixture was poured into 50 ml of water. Ethanol was added to the aqueous suspension until a clear solution was obtained, which was extracted three times with 100 ml dichloromethane. The organic solvent was evaporated and the crude product was purified by flash chromatography to give ethyl 1-(2,2-dicarboethoxyethyl)-4-oxo-4H-quinolizine-3-carboxylate (13) as a bright yellow solid (275 mg, 36%). M.p. 105-108° C. 1H NMR (δ, CDCl3): 1.22 (t, J=7 Hz, 6H), 1.41 (t, J=7 Hz, 3H), 3.41 (d, J=7 Hz, 2H), 3.65 (t, J=7 Hz, 1H), 4.10-4.25 (m, 4H), 4.41 (q, J=7 Hz, 2H), 7.23 (m, 1H), 7.70 (m, 1H), 7.84 (d, J=8 Hz, 1H), 8.33 (s, 1H), 9.50 (d, J=7 Hz, 1H). MS: m/z 389.1466; required for C20H23NO7: 389.1475.

Provenance & Evidence