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A mixture of acid 4 (250 mg, 0.900 mmol) and 3-amino-1-methyl-5-phenyl-2,3-dihydro-1H-1,4-benzodiazepin-2-one p-toluenesulfonate salt (364 mg, 0.820 mmol) in 4 mL of methylene chloride was stirred at 0° C. 1-Hydroxybenzotriazole hydrate (133 mg, 0.980 mmol), 1-[3-(dimethylamine)propyl]-3-ethylcarbodiimide hydrochloride (314 mg, 1.64 mmol) and triethylamine (0.51 mL, 3.7 mmol) were added sequentially. After the mixture was stirred for 16 h, 30 mL of ethyl acetate was added. The organic layer was washed with 1 M HCl (15 mL), 5% NaHCO3 (30 mL) and brine (30 mL), dried over anhydrous magnesium sulfate and concentrated under reduced pressure. Purification by chromatotron (30% ethyl acetate-hexane) afforded two diastereomers A and B. A: 120 mg (25%); 1H NMR (300 MHz, CDCl3) δ 7.20-7.70 (15H, m)), 5.54 (1H, d, J=8.0 Hz), 4.02 (1H, m), 3.48 (3H, s), 2.83-3.00 (1H, m), 2.62-2.74 (1H, m), 2.40-2.48 (1H, m), 1.00-2.00 (13H, m); MS (ESI): 524 (M+H), 546 (M+Na), 522 (M−H), 558 (M+Cl). B: 120 mg (25%); 1H NMR (300 MHz, CDCl3) δ 7.60 (1H, d, J=6.9 Hz), 7.20-7.45 (14H, m), 5.56 (1H, d, J=8.4 Hz), 3.84 (1H, m), 3.48 (3H, s), 2.83-3.00 (1H, m), 2.62-2.74 (1H, m), 2.50-2.60 (1H, m), 1.00-1.95 (13H, m); MS (ESI): 524 (M+H), 546 (M+Na), 522 (M−H).

1. stirringAfter the mixture was stirred for 16 h
2. washThe organic layer was washed with 1 M HCl (15 mL), 5% NaHCO3 (30 mL) and brine (30 mL)
3. dry with materialdried over anhydrous magnesium sulfate
4. concentrationconcentrated under reduced pressure
5. customPurification by chromatotron (30% ethyl acetate-hexane)
6. customafforded two diastereomers A and B