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

Temperature

60 °C

A mixture of hydroxylammonium chloride (615 mg), sodium hydrogen carbonate (911 mg) and dimethyl sulfoxide (6 mL) was stirred at 60° C. for 30 min, a solution of 4′-({5-oxo-7-propyl-4-[1-(tetrahydro-2H-pyran-4-yl)piperidin-4-yl]-4,5-dihydro[1,2,4]triazolo[1,5-a]pyrimidin-6-yl}methyl)biphenyl-2-carbonitrile (317 mg) in dimethyl sulfoxide (3 mL) was added, and the mixture was stirred at 90° C. for 16 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 (5 mL). N,N′-Carbonyldiimidazole (115 mg) and then 1,8-diazabicyclo[5.4.0]undec-7-ene (108 mg) 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: methanol/ethyl acetate=5/95→30/70 (volume ratio)] and crystallized from acetonitrile to give the title compound as colorless crystals (108 mg, 31%).

1. stirringthe mixture was stirred at 90° C. for 16 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 (5 mL)
6. additionN,N′-Carbonyldiimidazole (115 mg) and then 1,8-diazabicyclo[5.4.0]undec-7-ene (108 mg) 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: methanol/ethyl acetate=5/95→30/70 (volume ratio)]
13. customcrystallized from acetonitrile

ORD record

ord-d801baac10af47ab9579deaed792039c

Source dataset

uspto-grants-2014_12

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08921379B2