反应详情

To a solution of 3-amino-N-[2-chloro-4-[[[(3-hydroxyphenyl)methyl]amino]carbonyl]benzoyl]-L-alanine, methyl ester (Example 72; 50 mg, 0.123 mmol) in methanol (2 mL) were added triethylamine (3 drops) and aminoiminomethanesulfonic acid (prepared according to Kim, K. et al. Tetrahedron Lett. 1988, 29, 3183-3186; 37 mg, 0.30 mmol). The reaction was stirred at room temperature overnight, and then the solvent was evaporated. The residue was suspended in tetrahydrofuran/methanol/water (3:1:1; 2 mL) and lithium hydroxide monohydrate (20 mg, 0.48 mmol) was added. The reaction mixture was stirred at room temperature for 1 h, then the solvent was evaporated and the residue was purified by reverse phase HPLC to give N-[2-chloro-4-[[[(3-hydroxyphenyl)methyl]amino]carbonyl]benzoyl]-3-(aminoiminomethyl)amino-L-alanine (17 mg, 33%) as a white powder.

1. customthe solvent was evaporated
2. stirringThe reaction mixture was stirred at room temperature for 1 h
3. customthe solvent was evaporated
4. customthe residue was purified by reverse phase HPLC