反应详情

温度

70 °C

Sodium triacetoxyborohydride (671 mg, 3.17 mmol) and paraformaldehyde (95 mg, 3.17 mmol) were successively added to a suspension of (E)-3-(2-oxo-2,4-dihydro-1H-spiro[[1,8]naphthyridine-3,4′-piperidine]-6-yl)acrylic acid (455 mg, 1.58 mmol) in 1,2-dichloroethane (40 mL) at room temperature. The reaction mixture was then heated to 70° C. and stirred for 2 hours. The reaction mixture was cooled to room temperature, the precipitated product filtered and washed with H2O (50 mL) and MeOH (3×50 mL) and dried. The title product was obtained as a white solid (319 mg, 66%, py 74.1%).

1. temperatureThe reaction mixture was cooled to room temperature
2. filtrationthe precipitated product filtered
3. washwashed with H2O (50 mL) and MeOH (3×50 mL)
4. customdried