Hydrochloric Acid → HCID 178429711, compound

Participants

Reaction Conditions

Reaction Steps

To a solution of 19 g of sodium hydrosulfide dissolved in 2 liter of water. 19 g (79 mmole) of 7-chloro-3-ethoxycarbonyl-5-methylpyrazolo[1,5-a]pyrimidine was added and stirred at 60° C. for 1 hour. 1he pH of the mixture was adjusted to about 2 with 2N hydrochloric acid under ice-cooling and stirring and the crystals precipitated were collected by filtration and washed with water. The crystals obtained were added to a solution containing 20 g of potassium hydroxide and 150 ml of water and stirred at 60° C. for 2 hours. Then, the pH thereof was adjusted to about 2 with 6N hydrochloric acid under ice-cooling and stirring and the crystals precipitated were collected by filtration. The crystals obtained were washed with water and then dried to obtain 15.8 g of the title compound (Yield: 95.6%).

Provenance & Evidence