Trifluoroacetic acid → HCID 42634257, compound

Participants

Reaction Steps

To a solution of (2R,4S)-4-{(3,5-bis-trifluoromethyl-benzyl)-[5-(1-methyl-1H-pyrazol-4-yl)-pyrimidin-2-yl]-amino}-2-ethyl-pyrrolidine-1-carboxylic acid tert-butyl ester (0.200 mmol; 120 mg) in dichloromethane (2.0 mL) is added trifluoroacetic acid (0.7 mL). The mixture is stirred for 1 hour, and then concentrated under reduced pressure. To a mixture of the obtained residue and N,N-diisopropylethylamine (1.6 mmol; 207 mg) is added isopropyl chloroformate (0.4 mmol; 49 mg). The mixture is stirred for 1 hour at room temperature, and then diluted with water and dichloromethane. The organic layer is separated to concentrated under reduced pressure. The obtained residue is purified by silica gel column chromatography (eluent: n-hexane/EtOAc) to give (2R,4S)-4-{(3,5-Bis-trifluoromethyl-benzyl)-[5-(1-methyl-1H-pyrazol-4-yl)-pyrimidin-2-yl]-amino}-2-ethyl-pyrrolidine-1-carboxylic acid isopropyl ester (51 mg, 73%); ESI-MS m/z: 599 [M+1]+, Retention time 2.15 min (condition A).

Provenance & Evidence