p-Toluenesulfonic acid → HCID 136063682, compound

Participants

Reaction Conditions

Reaction Steps

A mixture of 4-(4-oxocyclohexyl)-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 (0.30 g), 1,2-dihydroxyethyl acetate (0.15 g), 4-methylbenzenesulfonic acid (0.011 g) and toluene (20 mL) was heated under reflux for 24 hr using a Dean-Stark trap. The reaction mixture was added to saturated aqueous sodium hydrogen carbonate solution, and the mixture was extracted with ethyl acetate. The organic layer was washed with saturated brine, and dried over anhydrous magnesium sulfate. The solvent was evaporated under reduced pressure, and the residue was dissolved in 1 M aqueous sodium hydroxide solution (3 mL), tetrahydrofuran (3 mL) and methanol (3 mL), and the mixture was stirred at 50° C. for 15 hr. The solvent was evaporated under reduced pressure, the residue was adjusted to pH 7 with 1 M hydrochloric acid, and the mixture was extracted with ethyl acetate. The organic layer was washed with saturated brine, and dried over anhydrous magnesium sulfate. The solvent was evaporated under reduced pressure, and the residue was purified by silica gel column chromatography and HPLC to give the title compound as a colorless solid (0.081 g, 23%).

Provenance & Evidence