反应详情

75 mg of (S)-2-{[1-(1-Ethyl-propyl)-2-(tetrahydro-furan-2-ylmethyl)-1H-benzoimidazole-5-carbonyl]-amino}-4-methyl-pentanoic acid tert-butyl ester were dissolved in 0.6 ml dichloromethane and 0.18 μl of trifluoroacetic acid were added. After stirring at room temperature over night the reaction mixture was concentrated. The residue was dissolved in 1 M aqueous sodium hydroxide solution, and precipitated by addition of 2 M aqueous hydrochloric acid. The solid was taken up in ethyl acetate, dried over sodium sulphate and concentrated. The obtained residue was precipitated by addition of pentane. 23 mg (35%) of (S)-2-{[1-(1-Ethyl-propyl)-2-(tetrahydro-furan-2-ylmethyl)-1H-benzoimidazole-5-carbonyl]-amino}-4-methyl-pentanoic acid were obtained.

1. concentrationwas concentrated
2. dissolutionThe residue was dissolved in 1 M aqueous sodium hydroxide solution
3. customprecipitated by addition of 2 M aqueous hydrochloric acid
4. dry with materialdried over sodium sulphate
5. concentrationconcentrated
6. customThe obtained residue was precipitated by addition of pentane