Ethyl orthoformate → 5-(Chloromethyl)-9-methyl-1,2,4-triazolo[4,3-c]quinazoline

Participants

Reaction Conditions

Reaction Steps

4. 58.2 g of 2-(chloromethyl)-4-hydrazino-6-methylquinazoline in 870 ml of triethyl orthoformate are heated to reflux temperature while stirring in an oil bath pre-heated to 100° C. and stirred at this temperature for a further 0.5 h. (bath temperature 140°-145° C.). About 40 ml of ethanol are distilled off during the heating. Thereafter, the mixture is concentrated in a vacuum to a volume of about 150 ml. 150 ml of diethyl ether are then added thereto, the mixture is cooled to 0° to 5° C. and the crystals are filtered off. The product is washed with ethanol/diethyl ether 1:2 and with diethyl ether and dried in a vacuum. 55.1 g of crude 5-(chloro-methyl)-9-methyl-1,2,4-triazolo[4,3-c]quinazoline of m.p. 175° C. are obtained.

Provenance & Evidence