Sodium Carbonate → Racemic 4-(trans-2,5-dimethylpiperazine-1-yl)-1-phenylpyrido[3,4-d]pyridazine

온도

100 °C

Tetrakis(triphenylphosphine)palladium (146 mg, 126 μmol), phenylboronic acid (461 mg, 3.78 mmol), 2 M sodium carbonate (2520 μl, 5.04 mmol), and 1-chloro-4-(trans-2,5-dimethylpiperazine-1-yl)pyrido[3,4-d]pyridazine 43 (700 mg, 2.52 mmol) were added to a round bottom flask. The reaction vessel was purged with nitrogen and toluene (25 mL) was added. The reaction was heated to 100° C. overnight. After cooling to RT, the reaction was diluted with 250 mL of ethyl acetate and washed with 1×50 mL of sat. NaHCO3 and 1×50 mL of brine. The organic layer was dried over MgSO4, filtered, and concentrated. Purification by column chromatography (10:0.5:0.1 CH2Cl2:MeOH, Et3N) afforded racemic 4-(trans-2,5-dimethylpiperazine-1-yl)-1-phenylpyrido[3,4-d]pyridazine 44 (750 mg, 93% yield). 1H-NMR (400 MHz, CDCl3): δ 9.76 (d, J=1.2 Hz, 1H), 8.94 (d, J=5.5 Hz, 1H), 7.84 (dd, J=5.9, 1.2 Hz, 1H), 7.78 (m, 2H), 7.57 (m, 2H), 3.83 (dqd, J=10.2, 5.9, 3.1 Hz, 1H), 3.47 (dd, J=12.1, 2.7 Hz, 1H), 3.30 (dqd, J=9.8, 6.3, 2.7 Hz, 1H), 3.25 (dd, J=12.5, 3.1 Hz, 1H), 2.94 (dq J=12.1, 10.2 Hz, 1H), 2.73 (dd, J=12.1, 9.8 Hz, 1H), 1.17 (d, J=6.3 Hz, 1H), 1.11 (d, J=6.6 Hz, 1H). MS 319.2 (calc'd) 320.2 (M+H, found).

1. customThe reaction vessel was purged with nitrogen and toluene (25 mL)
2. additionwas added
3. temperatureAfter cooling to RT
4. additionthe reaction was diluted with 250 mL of ethyl acetate
5. washwashed with 1×50 mL of sat. NaHCO3 and 1×50 mL of brine
6. dry with materialThe organic layer was dried over MgSO4
7. filtrationfiltered
8. concentrationconcentrated
9. customPurification by column chromatography (10:0.5:0.1 CH2Cl2:MeOH, Et3N)

ORD 기록

ord-ece8357287fb46deafe8e9f8339aead6

출처 데이터셋

uspto-grants-2012_07

DOI

10.6084/m9.figshare.5104873.v1

특허 번호

US08222251B2