反应详情

温度

130 °C

8-chloro-5-phenylpyrido[3,2-d]pyridazine 71 (374 mg, 1.548 mmol) and (R)-tert-butyl 3-methylpiperazine-1-carboxylate (1240 mg, 6.19 mmol) were combined in a reaction vial and heated to 130° C. for 3 h. After cooling to room temperature, the resulting solid was dissolved in 100 mL of CH2Cl2 and washed with 1×10 mL of saturated NaHCO3, followed by 1×10 mL of brine. The combined organic layers were dried over MgSO4, filtered and concentrated. Purification by column chromatography afforded pure (R)-tert-butyl 3-methyl-4-(5-phenylpyrido[3,2-d]pyridazin-8-yl)piperazine-1-carboxylate 74. 1H-NMR (400 MHz, CDCl3): δ 9.08 (dd, J=4.3, 1.6 Hz, 1H), 8.32 (dd, J=8.2, 1.6 Hz, 1H), 7.70 (m, 2H), 7.67 (dd, J=8.6, 4.3 Hz, 1H), 7.53 (m, 3H), 4.70 (m, 1H), 4.30-3.67 (series of m, 2H), 3.66 (ddd, J=13.3, 12.1, 3.5 Hz, 1H), 3.35 (m, 2H), 1.51 (s, 9H), 1.36 (br d, J=6.3 Hz, 3H). MS 405.2 (calc'd) 406.1 (M+H, found).

1. temperatureAfter cooling to room temperature
2. washwashed with 1×10 mL of saturated NaHCO3
3. dry with materialThe combined organic layers were dried over MgSO4
4. filtrationfiltered
5. concentrationconcentrated
6. customPurification by column chromatography