Ethyl chloroacetate → Ethyl (7-chloro-2,4-dioxo-3,4-dihydroquinazolin-1(2H)-yl)acetate

Participants

Reaction Steps

As in Example 1, 7-chloro-2,4-dioxo-1,2,3,4-tetrahydroquinazoline (20 g) was silylated and the toluene was distilled off to give a concentrate containing 7-chloro-2,4-bis(trimethylsilyloxy)quinazoline. To this concentrate were added propylene carbonate (40 ml), ethyl chloroacetate (16.21 g) and bromotrimethylsilane (3.11 g), and the reaction was carried out at an internal temperature of 125˜140° C. for 8 hours. This reaction mixture was cooled to ≦70° C. and worked up as in Example 1 to provide ethyl 2-(7-chloro-2,4-dioxo-1,2,3,4-tetrahydroquinazolin-1-yl)acetate (27.90 g).

Provenance & Evidence