Hydrochloric Acid → HCID 21075721, compound

Participants

Reaction Steps

A solution of tert-butyl (2-propyl-1H-imidazo[4,5-c]quinolin-1-yl)carbamate (7.23 g, 22.2 mmol) in 40 mL of ethanol was treated with HCl (37 mL, 111 mmol, 3 M in ethanol) and heated to reflux. After 1 h, the reaction mixture was cooled to ambient temperature, diluted with 80 mL of diethyl ether, and cooled in an ice water bath. The HCl salt of the product was collected by vacuum filtration and rinsed with diethyl ether until the filtrate ran clear. The dried HCl salt was dissolved in 75 mL of water and treated with 50% NaOH solution until the pH of the water was 12–13. The free base of the product precipitated out and was triturated in the basic water for 30 min while being cooled in an ice water bath. The solid was collected by vacuum filtration and dried under vacuum to give 4.64 g of 2-propyl-1H-imidazo[4,5-c]quinolin-1-amine as a tan granular solid.

Provenance & Evidence