反应详情

7-Chloro-2,4-dioxo-1,2,3,4-tetrahydroquinazoline (10 g) was treated as in Example 1 to give a concentrate containing 7-chloro-2,4-bis(trimethylsilyloxy)quinazoline. To this concentrate was added an oil prepared from ethyl chloroacetate (15 ml) and lithium bromide (2.21 g), and the reaction was carried out at an internal temperature of 115˜130° C. for 18 hours. This reaction mixture was cooled to ≦70° C. and worked up as in Example 4 to provide ethyl 2-(7-chloro-2,4-dioxo-1,2,3,4-tetrahydroquinazolin-1-yl)acetate (13.66 g).

1. customto give a concentrate
2. additionTo this concentrate was added an oil
3. temperatureThis reaction mixture was cooled to ≦70° C.