1-Methylimidazole → Ethyl 2-acetylamino-3-oxooctadecanoate

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A chlorobenzene solution (45.0 ml) of N-acetylglycine ethyl ester (1.50 g, 10.33 mmol) and N-methylimidazole (1.02 g, 12.40 mmol) was cooled to −20° C., and palmitoyl chloride (2.84 g, 10.33 mmol) was added thereto in nitrogen atmosphere. After the mixture was stirred for 45 minutes at the same temperature, titanium tetrachloride (6.86 mg, 36.16 mmol) and triethylamine (4.18 g, 41.31 mmol) were added thereto. The resulting mixture was stirred for 2 hours at −20° C. Water (20 mL) was added thereto, and the mixture was heated to room temperature, and the organic layer was separated. It was confirmed by comparative analysis with sample product using HPLC that the organic layer contained 2.92 g of the title compound (yield: 74%).

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