反应详情

A mixture of 4-(3-Hydroxypropyl)-4-hydroxy-cyclohexanone ethylene ketal (1.4 g) and diisopropylethylamine (3.37 mL) in methylene chloride (100 mL) at -78° C. was treated with triflic anhydride (1.64 mL). After 30 min the reaction mixture was washed with water, the solvent was dried over magnesium sulfate and removed in vacuo. The residue was dissolved in 30 mL of tetrahydrofuran and 15 mL of 3% HCl. After 5 h at room temperature the reaction mixture was diluted with water and the product was extracted with ether. After drying over magnesium sulfate the solvent was removed in vacuo to afford 1-Oxaspiro[4.5]decan-8-one as an oil.

1. washAfter 30 min the reaction mixture was washed with water
2. dry with materialthe solvent was dried over magnesium sulfate
3. customremoved in vacuo
4. dissolutionThe residue was dissolved in 30 mL of tetrahydrofuran
5. additionAfter 5 h at room temperature the reaction mixture was diluted with water
6. extractionthe product was extracted with ether
7. dry with materialAfter drying over magnesium sulfate the solvent
8. customwas removed in vacuo