Hydrochloric Acid → 7-Hydroxymethyl-7-methyl-1,4-dioxaspiro[4.5]decan-8-one

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Reaction Steps

7-Methyl-1,4-dioxaspiro[4.5]decan-8-one (10.5 g, 62 mmol) was dissolved in methanolic potassium hydroxide solution (10 w/w %, 60 g). To the solution was added dropwise a solution of aqueous formaldehyde solution (37%, 4.6 ml) in methanol (5 ml) under ice-cooling over 20 min, and the mixture was stirred for 30 min. Then, to the reaction mixture were added 1 N hydrochloric acid and saturated aqueous ammonium chloride solution, and the mixture was extracted three times with chloroform. The combined organic layers were dried over magnesium sulfate. Magnesium sulfate was removed by filtration, and the filtrate was concentrated under reduced pressure. The residue was purified by silica gel chromatography to give the title compound (6.9 g, yield 56%).

Provenance & Evidence