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To a solution of 5 g of 4-(N-methoxy-N-methyl-carbamoyl)-piperidine-1-carboxylic acid benzyl ester (S. Nahm and S. W. Weinreb, Tetrahedron Letters, 22:3815–3818(1981)) in 50 mL of anhydrous THF cooled to 0° C., was added dropwise 6 mL of 3M methylmagnesium bromide in ether over 10 minutes. After stirring for 1 h at 0° C., the resulting mixture was quenched with 50 mL of 1N HCl and extracted with 3×50 mL of ether. The combined extracts were dried over magnesium sulfate and concentrated to dryness under reduced pressure. Drying under vacuum gave 4-Acetyl-piperidine-1-carboxylic acid benzyl ester as a white solid:

1. customthe resulting mixture was quenched with 50 mL of 1N HCl
2. extractionextracted with 3×50 mL of ether
3. dry with materialThe combined extracts were dried over magnesium sulfate
4. concentrationconcentrated to dryness under reduced pressure
5. customDrying under vacuum