Acetic Acid → 5-((3,3-Difluorocyclobutyl)methyl)-2,2-dimethyl-1,3-dioxane-4,6-dione

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Reaction Steps

A solution of 5-(3,3-difluorocyclobutanecarbonyl)-2,2-dimethyl-1,3-dioxane-4,6-dione (15.0 g, 57.3 mmol) in THF (200 mL) was cooled to −5° C. and acetic acid (38 g, 0.63 mol) was added. The mixture was stirred for 5 min and sodium borohydride (6.5 g, 0.17 mol) was added in portions. The reaction mixture was stirred for 2 h at −5° C. and then poured into ice water (200 mL). The resulting mixture was extracted with EtOAc (300 mL×3). The organic extracts were combined, dried over anhydrous sodium sulfate, and concentrated. The residue was purified by flash column chromatography on silica gel (dichloromethane/methanol=100:1 to 30:1) to afford 5-((3,3-difluorocyclobutyl)methyl)-2,2-dimethyl-1,3-dioxane-4,6-dione (8.2 g, 58% yield).

Provenance & Evidence