Phosphorus oxychloride → 2-(1-Methyl-1H-pyrazol-5-yl)-5-[4-(trifluoromethyl)phenyl]-1,3,4-oxadiazole

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

Phosphorus oxychloride (1.80 mL) was added to an acetonitrile (4.8 mL) suspension of 1-methyl-N′-[4-(trifluoromethyl)benzoyl]-1H-pyrazol-5-carbohydrazide (300 mg) at a room temperature, and the obtained solution was then heated to reflux at 90° C. for 15 hours. Thereafter, the reaction solution was concentrated under a reduced pressure. A saturated sodium carbonate aqueous solution was added to the residue to convert it to a basic solution, and the resulting solution was then extracted with ethyl acetate. The organic layer was washed with a saturated saline, and was then dried over anhydrous magnesium sulfate, followed by vacuum concentration, so as to obtain the title compound (230 mg) in the form of a brown solid.

Herkunft & Nachweise