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温度

0 °C

Boc-Ser-OtBu (200 mg, 0.77 mmol) was dissolved in 3 mL of methylene chloride and cooled down to 0° C. N,N′-carbonyldiimidazole (124 mg, 0.77 mmol) was added thereto and stirred at room temperature for 2 hours. After removing a solvent, 3-aminobenzenesulfonic acid (132.6 mg, 0.77 mmol), 2 mL of DMF and 0.4 mL of diisopropylethylamine were added thereto and stirred at 70° C. overnight. After removing a solvent, the mixture was purified in accordance with the purification process A to obtain an intermediate. The obtained intermediate was dissolved in 1 mL of TFA and stirred at room temperature for 2 hours. After removing a solvent, purification was conducted in accordance with the purification process A to obtain a title compound.

1. additionwere added
2. stirringstirred at 70° C. overnight
3. customAfter removing a solvent
4. customthe mixture was purified in accordance with the purification process
5. customA to obtain an intermediate
6. stirringstirred at room temperature for 2 hours
7. customAfter removing
8. customa solvent, purification