反应详情

A solution of 62 g (0.61 mole) of 3-amino-2-oxazolidone in 650 ml of benzene was treated with 15 drops of HCl (isopropanol) solution using mechanical stirring, and refluxed until all water was removed via a Dean-Stark trap. The solution was then treated with 107 g (0.60 mole) of 6-methoxy-4-chromanone and refluxed for 11.5 hr. A 9.6 ml portion of water (theory: 10.8 ml) was collected. The reaction mixture was stripped of benzene under the water pump. The residue was taken up in 200 ml of 1:1 isopropanol:ether, stored 24 hr at room temperature, refrigerated overnight and filtered. The resultant cream-colored solid was washed with 125 ml of isopropanol, ether, and dried. M.p. 54°-64°; yield: 115 g (73%).

1. customwas removed via a Dean-Stark trap
2. temperaturerefluxed for 11.5 hr
3. customA 9.6 ml portion of water (theory: 10.8 ml) was collected
4. filtrationfiltered
5. washThe resultant cream-colored solid was washed with 125 ml of isopropanol, ether
6. customdried