反应详情

5.9 g (0.079 M) of acetyl chloride were added over 30 minutes at 20° to a mixture of 2,6,10,10-tetramethyl-1-oxa-spiro[4.5]decan-6-ol -- isomer A; see Example 1 -- and 10.9 g of N,N-dimethylaniline. After having been kept for 2 days at room temperature the reaction mixture was heated to reflux during 3 hours, then cooled and treated with 50 ml of ether. The reaction mixture was then filtered and the clear filtrate thus obtained poured onto crushed ice and finally acidified with a 10% aqueous solution of H2SO4. The organic layer was then washed with NaHCO3 in water, dried, evaporated and subjected to a fractional distillation to give 2.5 g of a product having b.p. 90°-100°/0.1 Torr. After crystallisation in aqueous ethanol 1.9 g (75%) of the desired ester were isolated -- isomer A.

1. temperaturethe reaction mixture was heated
2. temperatureto reflux during 3 hours
3. temperaturecooled
4. filtrationThe reaction mixture was then filtered
5. customthe clear filtrate thus obtained
6. additionpoured
7. customonto crushed ice
8. washThe organic layer was then washed with NaHCO3 in water
9. customdried
10. customevaporated
11. distillationsubjected to a fractional distillation