反应详情

2. 114.1 g of 2-chloromethyl-6-methyl-3H-quina-zolin-4-one are dissolved in 1.11 of chloroform and 120 ml of N,N,4-trimethylaniline, treated with 53 ml of phosphorus oxychloride and heated at reflux temperature for 20 h. The reaction mixture is evaporated in a vacuum. The residue is dissolved in 1.0 l of ethyl acetate and washed in succession with 2N hydrochloric acid, water, saturated aqueous sodium hydrogen carbonate solution and saturated aqueous sodium chloride solution. The organic extracts are concentrated to about 0.51 in a vacuum. The mixture is left to crystallize at -25° C. overnight. The crystal slurry is filtered, the crystals are washed with ethyl acetate (-25° C.) and dried in a vacuum. 89.9 g of 4-chloro-2-(chloromethyl)-6-methylquinazoline of m.p. 111°-112° C. are obtained. A further 11.1 g of 4-chloro-2-(chloromethyl)-6-methylquinazoline of m.p. 114°-116° C. can be obtained from the mother liquor.

1. temperatureheated
2. temperatureat reflux temperature for 20 h
3. customThe reaction mixture is evaporated in a vacuum
4. dissolutionThe residue is dissolved in 1.0 l of ethyl acetate
5. washwashed in succession with 2N hydrochloric acid, water, saturated aqueous sodium hydrogen carbonate solution and saturated aqueous sodium chloride solution
6. concentrationThe organic extracts are concentrated to about 0.51 in a vacuum
7. waitThe mixture is left
8. customto crystallize at -25° C. overnight
9. filtrationThe crystal slurry is filtered
10. washthe crystals are washed with ethyl acetate (-25° C.)
11. customdried in a vacuum