反应详情

Trifluoroacetic acid (20 mL) was added to a solution of N-[2-chloro-4-[[[(3-hydroxyphenyl)methyl]amino]carbonyl]-6-methylbenzoyl]-3-[[(1,1-dimethylethoxy)carbonyl]amino]-L-alanine, methyl ester (800 mg, 1.54 mmol) in dichloromethane (20 mL). The solution was stirred at room temperature for 1 h. The reaction mixture was concentrated, azeotroped three times with dichloromethane/hexanes, and then held under high vacuum for 35 min. 1 M HCl (4.6 mL, 4.6 mmol) was added, along with acetonitrile (4 mL) and the mixture was freeze-dried overnight to give crude 3-amino-N-[2-chloro-4-[[[(3-hydroxyphenyl)methyl]amino]carbonyl]-6-methylbenzoyl]-L-alanine, methyl ester hydrochloride (0.85 g, 120% of the theoretical amount).

1. concentrationThe reaction mixture was concentrated
2. customazeotroped three times with dichloromethane/hexanes
3. waitheld under high vacuum for 35 min
4. customthe mixture was freeze-dried overnight