反应详情

To a suspension of potassium tert-butoxide (3.48 g) in tert-butanol (32 mL) was added cycloheptanone (1.9 mL) while stirring under nitrogen atmosphere, followed by stirring the mixture at room temperature for 0.5 hour. Then, to the reaction mixture was added (2-chloroethyl)-dimethylsulfonium iodide (3.7 g) in eight portions over 1.6 hours, followed by stirring the mixture at room temperature for 16.5 hours. To the reaction mixture was added water, followed by extraction with diethyl ether. The organic layer was washed with saturated brine, dried and concentrated. The residue was purified by column chromatography on silica gel (diethyl ether:hexane (volume ratio)=1:15) to give spiro[2.6]nonan-4-one (1.40 g).

1. stirringby stirring the mixture at room temperature for 0.5 hour
2. stirringby stirring the mixture at room temperature for 16.5 hours
3. extractionfollowed by extraction with diethyl ether
4. washThe organic layer was washed with saturated brine
5. customdried
6. concentrationconcentrated
7. customThe residue was purified by column chromatography on silica gel (diethyl ether:hexane (volume ratio)=1:15)