Acetone Cyanohydrin → 3-(4-Chloro-2-nitrobenzoyl)-6,6-dimethylpiperidine-2,4-dione

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반응 단계

A solution of 4-chloro-2-nitrobenzoyl chloride (4.4 g) in dry dichloromethane (5 ml) was added at 5°-10° C. to a stirred solution of 6,6-dimethylpiperidine-2,4-dione (2.8 g) and triethylamine (2.8 ml) in dry dichloromethane (50 ml) and the mixture was stirred at ambient temperature for 18 hours. Triethylamine (8.4 ml) and acetone cyanohydrin (0.4 ml) were added successively to the solution and the mixture was stirred at ambient temperature for 4 hours. The resulting solution was washed successively with 2N hydrochloric acid (25 ml) and water (3×25 ml), dried over sodium sulphate and evaporated under reduced pressure to give a yellow solid which was recrystallised from acetonitrile to give 3-(4-chloro-2-nitrobenzoyl)-6,6-dimethylpiperidine-2,4-dione (4 g), mp 162°-162.5° C., as a yellow crystalline solid.

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