Hydrochloric Acid → 2,4-Diamino-6-(3,5-dichlorophenoxyimino)-5,6,7,8-tetrahydroquinazoline

Participants

Reaction Steps

A suspension of 2.5 grams (0.005 mole) of 2,4-di[(1,1-dimethylethyl)carbonylamino]-6-(3,5-dichlorophenoxyimino)-5,6,7,8-tetrahydroquinazoline in 40 mL of tetrahydrofuran is stirred, and a methanolic solution saturated with hydrogen chloride is added portionwise until a clear solution is obtained. After this time about 2 mL of water is added, and the reaction mixture is heated to reflux where it is stirred for about 4 hours. The reaction mixture is then cooled to ambient temperature and is washed with acetone. The reaction mixture is concentrated under reduced pressure, yielding 2,4-diamino-6-(3,5-dichlorophenoxyimino)-5,6,7,8-tetrahydroquinazoline.

Provenance & Evidence