Hydroxylamine HCl → 4-(1-benzylpiperidin-4-yl)-6-{[2'-(5-oxo-4,5-dihydro-1,2,4-oxadiazol-3-yl)biphenyl-4-yl]methyl}-7-propyl[1,2,4]triazolo[1,5-a]pyrimidin-5(4H)-one

HRID 1689112Notes

Reaction equation

HRID 1689112 reaction equation
[Cl-].O[NH3+:3].[C:4](=[O:7])([O-])[OH:5].[Na+].[CH2:9]([N:16]1[CH2:21][CH2:20][CH:19]([N:22]2[C:27](=[O:28])[C:26]([CH2:29][C:30]3[CH:35]=[CH:34][C:33]([C:36]4[C:37]([C:42]#[N:43])=[CH:38][CH:39]=[CH:40][CH:41]=4)=[CH:32][CH:31]=3)=[C:25]([CH2:44][CH2:45][CH3:46])[N:24]3[N:47]=[CH:48][N:49]=[C:23]23)[CH2:18][CH2:17]1)[C:10]1[CH:15]=[CH:14][CH:13]=[CH:12][CH:11]=1>CS(C)=O.C(OCC)(=O)C>[CH2:9]([N:16]1[CH2:21][CH2:20][CH:19]([N:22]2[C:27](=[O:28])[C:26]([CH2:29][C:30]3[CH:35]=[CH:34][C:33]([C:36]4[CH:41]=[CH:40][CH:39]=[CH:38][C:37]=4[C:42]4[NH:3][C:4](=[O:7])[O:5][N:43]=4)=[CH:32][CH:31]=3)=[C:25]([CH2:44][CH2:45][CH3:46])[N:24]3[N:47]=[CH:48][N:49]=[C:23]23)[CH2:18][CH2:17]1)[C:10]1[CH:15]=[CH:14][CH:13]=[CH:12][CH:11]=1

Participants

6

Reactant 3

HCID 21645Hydroxylamine HClHCID 516892Sodium BicarbonateHCID 670101534'-{[4-(1-Benzylpiperidin-4-yl)-5-oxo-7-propyl-4,5-dihydro[1,2,4]triazolo[1,5-a]pyrimidin-6-yl]methyl}biphenyl-2-carbonitrile

Product 1

HCID 1360638814-(1-benzylpiperidin-4-yl)-6-{[2'-(5-oxo-4,5-dihydro-1,2,4-oxadiazol-3-yl)biphenyl-4-yl]methyl}-7-propyl[1,2,4]triazolo[1,5-a]pyrimidin-5(4H)-oneYield 16%

Reagents, catalysts & solvents 2

HCID 679Dimethyl SulfoxideSolvent2×HCID 8857Ethyl AcetateSolvent

Conditions

Temperature
50 °C

Procedure

A mixture of hydroxylammonium chloride (1.44 g), sodium hydrogen carbonate (2.32 g) and dimethyl sulfoxide (15 mL) was stirred at 50° C. for 30 min, a solution of 4′-{[4-(1-benzylpiperidin-4-yl)-5-oxo-7-propyl-4,5-dihydro[1,2,4]triazolo[1,5-a]pyrimidin-6-yl]methyl}biphenyl-2-carbonitrile (749 mg) in dimethyl sulfoxide (3 mL) was added, and the mixture was stirred at 90° C. for 17 hr. The reaction mixture was diluted with ethyl acetate, washed with water and then with saturated brine, and dried over anhydrous magnesium sulfate. The solvent was evaporated under reduced pressure, and the residue was dissolved in tetrahydrofuran (10 mL). N,N′-Carbonyldiimidazole (269 mg) and then 1,8-diazabicyclo[5.4.0]undec-7-ene (0.25 mL) were added, and the mixture was stirred at room temperature for 2 hr. The reaction mixture was diluted with ethyl acetate, washed with saturated aqueous potassium hydrogensulfate solution and then with saturated brine, and dried over anhydrous magnesium sulfate. The solvent was evaporated under reduced pressure, and the residue was purified by silica gel chromatography [eluent: hexane/ethyl acetate=50/50→10/90 (volume ratio)], and crystallized from a mixture of ethyl acetate and diisopropyl ether to give the title compound as colorless crystals (133 mg, 16%).

Workup

  1. stirringthe mixture was stirred at 90° C. for 17 hr
  2. washwashed with water
  3. dry with materialwith saturated brine, and dried over anhydrous magnesium sulfate
  4. customThe solvent was evaporated under reduced pressure
  5. dissolutionthe residue was dissolved in tetrahydrofuran (10 mL)
  6. additionN,N′-Carbonyldiimidazole (269 mg) and then 1,8-diazabicyclo[5.4.0]undec-7-ene (0.25 mL) were added
  7. stirringthe mixture was stirred at room temperature for 2 hr
  8. additionThe reaction mixture was diluted with ethyl acetate
  9. washwashed with saturated aqueous potassium hydrogensulfate solution
  10. dry with materialwith saturated brine, and dried over anhydrous magnesium sulfate
  11. customThe solvent was evaporated under reduced pressure
  12. customthe residue was purified by silica gel chromatography [eluent: hexane/ethyl acetate=50/50→10/90 (volume ratio)]
  13. customcrystallized from a mixture of ethyl acetate and diisopropyl ether

Sources & evidence

ORD record
ord-8af714d5cc8e4ea29f9fe2b51961ee4f
Source dataset
uspto-grants-2012_04
Patent number
US08148383B2

Reaction notes

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