Potassium Carbonate → 7-(4-chlorophenyl)-2-((6-chloropyridin-3-yl)methyl)-8-(pyridin-4-yl)-[1,2,4]triazolo[4,3-b]pyridazin-3(2H)-one

HRID 2224242Notes

Reaction equation

[Cl:1][C:2]1[CH:7]=[CH:6][C:5]([C:8]2[CH:13]=[N:12][N:11]3[C:14](=[O:17])[NH:15][N:16]=[C:10]3[C:9]=2[C:18]2[CH:23]=[CH:22][N:21]=[CH:20][CH:19]=2)=[CH:4][CH:3]=1.C([O-])([O-])=O.[K+].[K+].[Cl:30][C:31]1[CH:36]=[CH:35][C:34]([CH2:37]Cl)=[CH:33][N:32]=1>CN(C=O)C.O>[Cl:1][C:2]1[CH:7]=[CH:6][C:5]([C:8]2[CH:13]=[N:12][N:11]3[C:14](=[O:17])[N:15]([CH2:37][C:34]4[CH:33]=[N:32][C:31]([Cl:30])=[CH:36][CH:35]=4)[N:16]=[C:10]3[C:9]=2[C:18]2[CH:23]=[CH:22][N:21]=[CH:20][CH:19]=2)=[CH:4][CH:3]=1

Participants

Conditions

Temperature: 70 °C

Procedure

To a solution of 7-(4-chlorophenyl)-8-(pyridin-4-yl)-[1,2,4]triazolo[4,3-b]pyridazin-3(2H)-one (150 mg, 0.46 mmol), prepared as described in Example 244, in DMF (3 mL) was added K2CO3 (80 mg, 0.58 mmol) and 2-chloro-5-(chloromethyl)pyridine (90 mg, 0.556 mmol). The reaction mixture was stirred at 70° C. for 15 min. After this time, the solution was cooled to RT and diluted with water (20 mL). The resulting solid was collected by filtration and the crude product was purified by reverse phase HPLC to give the title compound, 7-(4-chlorophenyl)-2-((6-chloropyridin-3-yl)methyl)-8-(pyridin-4-yl)-[1,2,4]triazolo[4,3-b]pyridazin-3(2H)-one, (110 mg, 52%), as a yellow solid. HPLC: 2.61 min; MS, M+H=449; 1H NMR (CDCl3) δ 8.62 (2H, d, J=5.0 Hz), 8.43 (1H, d, J=5.0 Hz), 8.19 (1H, s), 7.33 (1H, d, J=5.0 Hz), 7.29-7.31 (3H, m), 7.20 (2H, d, J=5.0 Hz), 7.08 (2H, d, J=10.0 Hz), 5.17 (2H, s).

Workup

temperatureAfter this time, the solution was cooled to RT
filtrationThe resulting solid was collected by filtration
customthe crude product was purified by reverse phase HPLC

Sources & evidence

ORD record: ord-8ee0aa89f7e74392b1178596d1462119
Source dataset: uspto-grants-2008_05
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07378418B2

Reaction notes

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