反应详情

Ethyl 2-phenylacetoacetate (1.0 g, 4.85 mmol) and urethane (0.43 g, 4.85 mmol) were heated, neat, with Phosphorous oxychloride (3 mL) at 90° C. for 3 hours. The excess reagents were removed under vacuum and the resulting residue was triturated with benzene and filtered. This solid was triturated with diethyl ether, filtered, and dried to yield 0.818 g (83%). MS (DCI/NH3) m/z 204 (M+H)+; 1H NMR (300 MHz, DMSO-d6) δ 1.98 (s, 3 H) 7.28 (m, 2 H) 7.39 (m, 3 H) 11.65 (s, 1 H).

1. customThe excess reagents were removed under vacuum
2. customthe resulting residue was triturated with benzene
3. filtrationfiltered
4. customThis solid was triturated with diethyl ether
5. filtrationfiltered
6. customdried
7. customto yield 0.818 g (83%)