反应详情

A mixture of 38.6 g of 2,3-dihydro-2,2-dimethyl-7-hydroxy-4H-1,3-benzoxazin-4-one, 55.2 g of potassium carbonate, 47.2 g of 1-bromo-3-chloro-propane and 600 ml of acetone is refluxed for 24 hours. Filtering, concentrating the filtrate to 1/3 of the original volume and cooling yields 7-(3-bromopropoxy)-2,3-dihydro-2,2-dimethyl-4H-1,3-benzoxazin-4-one with a melting point of 111°-113°.

1. temperatureis refluxed for 24 hours
2. filtrationFiltering
3. concentrationconcentrating the filtrate to 1/3 of the original volume
4. temperaturecooling