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With dmap; diisopropyl-carbodiimide; In dichloromethane; at 20℃; for 5h;Inert atmosphere;
In a nitrogen atmosphere, 5.0 g of the compound represented by the formula (I-10-1), 3.6 g of the compound represented by the formula (I-10-2), 0.6 g of N, N-dimethylaminopyridine And 40 mL of dichloromethane were added. 3.9 g of diisopropylcarbodiimide was added dropwise while cooling with ice, and the mixture was stirred at room temperature for 5 hours. The precipitate was removed by filtration, and the filtrate was washed successively with 1% hydrochloric acid, water and brine. Purification by column chromatography (alumina, dichloromethane / hexane) gave 6.5 g of a compound represented by the formula (I-10-3).