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

HRID 2224244Notes

Reaction equation

HRID 2224244 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[CH2:31][C:32]1[CH:33]=[CH:34][C:35]([C:38]([F:41])([F:40])[F:39])=[N:36][CH:37]=1>CN(C=O)C>[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]([CH2:31][C:32]4[CH:37]=[N:36][C:35]([C:38]([F:41])([F:39])[F:40])=[CH:34][CH:33]=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

5

Reactant 3

HCID 11430Potassium CarbonateHCID 27738105-(Chloromethyl)-2-(trifluoromethyl)pyridineHCID 597167437-(4-chlorophenyl)-8-(pyridin-4-yl)-[1,2,4]triazolo[4,3-b]pyridazin-3(2H)-one

Product 1

HCID 119897617-(4-chlorophenyl)-8-(pyridin-4-yl)-2-((6-(trifluoromethyl)pyridin-3-yl)methyl)-[1,2,4]triazolo[4,3-b]pyridazin-3(2H)-oneYield 76.1%

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent

Conditions

Temperature
65 °C

Procedure

A solution of 7-(4-chlorophenyl)-8-(pyridin-4-yl)-[1,2,4]triazolo[4,3-b]pyridazin-3(2H)-one (1.1 g, 3.4 mmol), prepared as described in Example 244, K2CO3 (940 mg, 6.8 mmol), and 5-chloromethyl-2-trifluoromethylpyridine (800 mg, 4.1 mmol) in DMF (8.3 mL) was heated at 65° C. for 40 min. After this time, the solution was cooled to RT The reaction mixture was partitioned between water and EtOAc. The organic layer separated, washed with water and saturated aqueous NaCl. The organic layer was dried over magnesium sulfate, filtered and concentrated under reduced pressure. The crude product was purified by silica gel column chromatography eluting with hexanes/EtOAc to give the title compound, 7-(4-chlorophenyl)-8-(pyridin-4-yl)-2-((6-(trifluoromethyl)pyridin-3-yl)methyl)-[1,2,4]triazolo[4,3-b]pyridazin-3(2H)-one, (1.25 g, 76%) as a yellow solid. HPLC: 2.84 min; MS, M+H=483; 1H NMR (CDCl3) δ 8.80 (d, J=1.4 Hz, 1H), 8.65 (Abq, J=1.6, 4.4 Hz, 2H), 8.23 (s, 1H), 7.96 (m, 1H), 7.68 (d, J=8.3 Hz, 1H), 7.34 (m, 2H), 7.23 (m, 2H), 7.10 (m, 2H), 5.31 (2H).

Workup

  1. temperatureAfter this time, the solution was cooled to RT The reaction mixture
  2. customwas partitioned between water and EtOAc
  3. customThe organic layer separated
  4. washwashed with water and saturated aqueous NaCl
  5. dry with materialThe organic layer was dried over magnesium sulfate
  6. filtrationfiltered
  7. concentrationconcentrated under reduced pressure
  8. customThe crude product was purified by silica gel column chromatography
  9. washeluting with hexanes/EtOAc

Sources & evidence

ORD record
ord-bfe5866fcaab4a26876bdd9e4535f002
Source dataset
uspto-grants-2008_05
Patent number
US07378418B2

Reaction notes

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