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

HRID 2224250Notes

Reaction equation

HRID 2224250 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+].Br[CH2:31][C:32]1[CH:37]=[CH:36][C:35]([C:38]2[CH:42]=[CH:41][O:40][N:39]=2)=[CH:34][CH:33]=1>CN(C=O)C.CCOC(C)=O>[O:40]1[CH:41]=[CH:42][C:38]([C:35]2[CH:36]=[CH:37][C:32]([CH2:31][N:15]3[C:14](=[O:17])[N:11]4[N:12]=[CH:13][C:8]([C:5]5[CH:6]=[CH:7][C:2]([Cl:1])=[CH:3][CH:4]=5)=[C:9]([C:18]5[CH:23]=[CH:22][N:21]=[CH:20][CH:19]=5)[C:10]4=[N:16]3)=[CH:33][CH:34]=2)=[N:39]1

Participants

6

Reactant 3

HCID 11430Potassium CarbonateHCID 186634113-(4-(Bromomethyl)phenyl)isoxazoleHCID 597167437-(4-chlorophenyl)-8-(pyridin-4-yl)-[1,2,4]triazolo[4,3-b]pyridazin-3(2H)-one

Product 1

HCID 119897622-(4-(isoxazol-3-yl)benzyl)-7-(4-chlorophenyl)-8-(pyridin-4-yl)-[1,2,4]triazolo[4,3-b]pyridazin-3(2H)-one

Reagents, catalysts & solvents 2

HCID 6228DimethylformamideSolventHCID 8857Ethyl AcetateSolvent

Conditions

Temperature
65 °C

Procedure

To a solution of 7-(4-chlorophenyl)-8-(pyridin-4-yl)-[1,2,4]triazolo[4,3-b]pyridazin-3(2H)-one (0.27 g, 0.834 mmol), prepared as described in Example 244, in DMF (4 mL), potassium carbonate (0.23 g, 1.67 mmol) and 3-(4-(bromomethyl)phenyl)isoxazole (0.248 g, 1.04 mmol) were added. The resulting mixture was heated to 65° C. After 2 h, the reaction mixture was then cooled to RT and diluted with EtOAc (200 mL). The resultant solution was then washed with water and saturated aqueous NaCl. The organic layer was dried over magnesium sulfate, filtered and concentrated under reduced pressure. The residue was purified by column chromatography eluting with hexanes/EtOAc to give the title compound, 2-(4-(isoxazol-3-yl)benzyl)-7-(4-chlorophenyl)-8-(pyridin-4-yl)-[1,2,4]triazolo[4,3-b]pyridazin-3(2H)-one, as a light yellow solid. HPLC RT: 2.60 min; 1H NMR (CDCl3): δ 8.64 (d, J=1.1 Hz, 1H), 8.63 (d, J=1.7 Hz, 1H), 8.45 (d, J=1.7 Hz, 1H), 8.20 (s, 1H), 7.80 (d, J=8.2 Hz, 2H), 7.50 (d, J=8.2 Hz, 2H), 7.34 (m, 2H), 7.23 (m, 2H), 7.10 (m, 2H), 6.65 (d, J=2.2 Hz, 1H), 5.26 (s, 2H).

Workup

  1. temperaturethe reaction mixture was then cooled to RT
  2. washThe resultant solution was then washed with water and saturated aqueous NaCl
  3. dry with materialThe organic layer was dried over magnesium sulfate
  4. filtrationfiltered
  5. concentrationconcentrated under reduced pressure
  6. customThe residue was purified by column chromatography
  7. washeluting with hexanes/EtOAc

Sources & evidence

ORD record
ord-594383a151c445eebf676a7be53293f6
Source dataset
uspto-grants-2008_05
Patent number
US07378418B2

Reaction notes

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