Propargyl acetate → 2-[(Acetyloxy)methyl]pyrazolo[1,5-c]quinazolin-5(6H)-one

Participants

Reaction Steps

2.0 g of diazooxindole (0.013 mole) and 12.8 g (0.13 mole or 10 equivalents) of propargyl acetate are refluxed under argon for 4 hours. The reaction mixture is cooled, diluted with 200 ml of ether, stirred for 30 minutes and filtered. The light tan product is washed with ether, dried in vacuo for 1 hour at room temperature and treated with activated charcoal in a mixture of ethanol (200 ml) and ethyl acetate (100 ml). The reaction mixture is filtered through a Celite pad, concentrated to a volume ~100 ml, diluted with 100 ml ethyl acetate and concentrated to a volume of 50 ml. Another 100 ml of ethyl acetate is added, the resulting solution is concentrated to a volume of 50 ml and cooled to 0°-5°. The title compound is filtered off and dried.

Provenance & Evidence