Trifluoroacetic acid → 4-((R)-2-Amino-3-fluoro-propionyl)piperazine-1-carboxylic acid butyl ester
Reaction equation
[CH2:1]([O:5][C:6]([N:8]1[CH2:13][CH2:12][N:11]([C:14](=[O:26])[C@@H:15]([NH:18]C(OC(C)(C)C)=O)[CH2:16][F:17])[CH2:10][CH2:9]1)=[O:7])[CH2:2][CH2:3][CH3:4].C(O)(C(F)(F)F)=O>ClCCl>[CH2:1]([O:5][C:6]([N:8]1[CH2:9][CH2:10][N:11]([C:14](=[O:26])[C@@H:15]([NH2:18])[CH2:16][F:17])[CH2:12][CH2:13]1)=[O:7])[CH2:2][CH2:3][CH3:4]Participants
4
Reactant 2
Product 1
Reagents, catalysts & solvents 1
Procedure
To a solution of 230 mg 4-((R)-2-tert-Butoxycarbonylamino-3-fluoro-propionyl)-piperazine-1-carboxylic acid butyl ester in 5 ml dichloromethane was added 1.0 ml TFA. After 12 h stirring at RT the solvents were removed and the residue was codistilled twice with toluene. Yield: 307 mg.