Acetic Acid → (1s,3s,5r,6s)-5-{[Tert-butyl(dimethyl)silyl]oxy}-6-methyl-7-oxabicyclo[4.1.0]heptan-3-ol

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The compound of Example 16C (9.20 g, 30.6 mmol) was dissolved in 105 mL of methanol. K2CO3 (10.1 g, 72.1 mmol, 2.35 equivalents) was added and the reaction mixture was stirred at ambient temperature for 2 hours. 6.60 mL (115 mmol, 3.77 equivalents) of acetic acid were added to the reaction mixture; after mixing for 10 minutes, the solids were filtered off and rinsed with 40 mL of methanol. The combined filtrate and rinses were concentrated to a residue which was mixed with 106 mL of water. The layers were separated, and the aqueous layer was extracted three times with 50 mL of ethyl acetate. The combined organic layers were washed twice with 45 mL of brine, dried over MgSO4, filtered and concentrated to afford the titled compound (7.72 g, 98%).

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