Trifluoroacetic acid → HCID 131725184, compound

Participants

Reaction Steps

A solution of (2S)2-tert-butoxycarbonylamino-5-(3,4-dimethoxy-phenyl)-5-oxo-pentanoic acid benzyl ester (10.46 g, 0.023 mol) in dichloromethane (150 ml) was cooled to 0° C. in an ice bath. TFA (40 ml) was slowly added to the stirring mixture and the reaction was allowed to warm to room temperature over two hours. The reaction mixture was concentrated in vacuo. The resulting residue was dissolved in ethyl acetate and the pH was adjusted to 7 with 1N NaOH. The organic extract was washed with brine (100 ml). The ethyl acetate extract was dried over anhydrous Na2SO4 and concentrated in vacuo to afford (2S)5-(3,4-dimethoxy-phenyl)-3,4-dihydro-2H-pyrrole-2-carboxylic acid benzyl ester TFA salt (7.24 g, 0.021 mol, 91% yield). MS (LC-MS): Calculated for C20H21NO4 339.15. Found 340.16 (M+H)+.

Provenance & Evidence