Potassium Carbonate → 2-(4-(isoxazol-5-yl)benzyl)-7-(4-chlorophenyl)-8-(pyridin-4-yl)-[1,2,4]triazolo[4,3-b]pyridazin-3(2H)-one

HRID 2224248Notes

Reaction equation

HRID 2224248 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[O:42][N:41]=[CH:40][CH:39]=2)=[CH:34][CH:33]=1>CN(C=O)C>[O:42]1[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)=[CH:39][CH:40]=[N:41]1

Participants

5

Reactant 3

HCID 11430Potassium CarbonateHCID 229975455-(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 597165732-(4-(isoxazol-5-yl)benzyl)-7-(4-chlorophenyl)-8-(pyridin-4-yl)-[1,2,4]triazolo[4,3-b]pyridazin-3(2H)-one

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent

Conditions

Temperature
60 °C

Procedure

A solution of 7-(4-chlorophenyl)-8-(pyridin-4-yl)-[1,2,4]triazolo[4,3-b]pyridazin-3(2H)-one (3.0 g, 9.27 mmol), prepared as described in Example 244, K2CO3 (2.56 g, 18.53 mmol) and 5-(4-(bromomethyl)phenyl)isoxazole (2.65 g, 11.12 mmol), in DMF (23 mL), were added. The resulting mixture was heated to 60° C. After 2 h, the reaction mixture was cooled to RT and partitioned between water and EtOAc. The organic layer was separated and the aqueous layer was extracted with EtOAc (2×200 mL). The combined organic extracts were dried over magnesium sulfate, filtered and concentrated. The residue was purified by silica gel column chromatography using hexanes/EtOAc 1:10 to give the title compound, 2-(4-(isoxazol-5-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: 2.64 min; MS, M+H=481; 1H NMR (CDCl3): δ 8.62-8.64 (m, 2H), 8.29 (d, J=1.8 Hz, 1H), 8.20 (s, 1H), 7.77 (d, J=8.4 Hz, 2H), 7.51 (d, J=8.4 Hz, 2H), 7.33 (d, J=8.4 Hz, 2H), 7.22 (m, 2H), 7.09 (d, J=8.4 Hz, 2H), 6.51 (d, J=1.6 Hz, 1H), 5.25 (s, 2H).

Workup

  1. additionwere added
  2. temperaturethe reaction mixture was cooled to RT
  3. custompartitioned between water and EtOAc
  4. customThe organic layer was separated
  5. extractionthe aqueous layer was extracted with EtOAc (2×200 mL)
  6. dry with materialThe combined organic extracts were dried over magnesium sulfate
  7. filtrationfiltered
  8. concentrationconcentrated
  9. customThe residue was purified by silica gel column chromatography

Sources & evidence

ORD record
ord-32ce120751074e1097592a30c7140d90
Source dataset
uspto-grants-2008_05
Patent number
US07378418B2

Reaction notes

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