反应详情

A mixture of 71.04 g (0.5 mol) of 5-methyl-5-ethylhydantoin, 55.94 g (0.5 mol+5% excess) of 2-chloroethyl vinyl ether, 36.28 g (0.25 mol+5% excess) of anhydrous potassium carbonate and 150 ml of dimethylformamide is stirred, analogously to Example 1, for 4 hours and 35 minutes at 122°-129° C. After completion of the reaction, the reaction mixture is filtered and the clear filtrate is concentrated on a rotary evaporator at 80° C. under vacuum from a waterpump. The residue is taken up in 200 ml of acetone, 2 g of active charcoal are added and the mixture is kept at the boil for 15 minutes. It is then filtered and the filtrate is concentrated on a rotary evaporator at 60° C. under vacuum from a waterpump. The residue is freed from non-volatile constituents at 60° C. and 0.5 mm Hg and 86.9 g (81.9% of theory) of a yellowish, viscous crude product are obtained. This is purified by distillation in a high vacuum and 80.34 g (75.7% of theory) of the desired product, of boiling point 132° C./0.2 mm Hg, are obtained.

1. customAfter completion of the reaction
2. filtrationthe reaction mixture is filtered
3. concentrationthe clear filtrate is concentrated on a rotary evaporator at 80° C. under vacuum from a waterpump
4. addition2 g of active charcoal are added
5. waitthe mixture is kept at the boil for 15 minutes
6. filtrationIt is then filtered
7. concentrationthe filtrate is concentrated on a rotary evaporator at 60° C. under vacuum from a waterpump
8. customis freed from non-volatile constituents at 60° C.
9. custom0.5 mm Hg and 86.9 g (81.9% of theory) of a yellowish, viscous crude product are obtained
10. distillationThis is purified by distillation in a high vacuum and 80.34 g (75.7% of theory) of the desired product, of boiling point 132° C./0.2 mm Hg
11. customare obtained