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0 °C

DL-serine methylester HCl (14,6 g, 93,8 mmol) of the Chemical Formula 5 was suspended in 400 mL of dichloromethane, and Et3N (29 Ml, 206 mmol). and a catalytic amount of 4-dimethylaminopyridine were introduced therein while maintaining the temperature at 0° C., and 4-methoxybenzene-sulfonyl chloride (19.2 g 94 mmol) was add dropwise. They were stirred at room temperature for 20 hours, washed with 200 mL of distilled water, dried, and concentrated under reduced pressure to obtain a yellow solid title compound (26.5 g, yield 97%).

1. washwashed with 200 mL of distilled water
2. customdried
3. concentrationconcentrated under reduced pressure