Trifluoroacetic acid → HCID 10369410, compound

Participants

Reaction Steps

A solution of {(3S)-1-[(1S,2S)-(1-{[benzyloxycarbonyl-(2,4-dimethyl-benzyl)-amino]-methyl}-2-hydroxy-pent-3-ynyl)]-2-oxo-pyrrolidin-3-yl}-carbamic acid tert-butyl ester (1.16 g, 1.74 mmol, see procedure 1c above) was dissolved in CH2Cl2 (16 mL) and treated with TFA (8 mL). The solution was stirred for 3 h and then concentrated in vacuo. The residue was dissolved in CH2Cl2 and concentrated in vacuo; this procedure was repeated. A portion (0.22 mmol) of the product amine was dissolved in CH2Cl2 (4 mL). The resultant solution was charged sequentially with N, N-diisopropylethylamine (0.16 mL, 0.88 mmol) and (meta-trifluoromethyl-phenyl)isocyanate (0.033 mL, 0.22 mmol). The reaction was stirred for 12 h and partitioned between EtOAc and sat. NH4Cl. The organic phase was washed with sat. NaHCO3 and brine, and then dried (Na2SO4), filtered, and concentrated in vacuo. The residue was dissolved in MeOH (6 mL). The resultant solution was charged with 5% Pd/C, Degussa style (50 mg), stirred under H2 (1 atm) for 12 h at RT, filtered, and concentrated in vacuo. The residue was purified by reverse-phase HPLC to afford the title compound as a white powder after lyopholization. MS found: (M+H)+=521.5.

Provenance & Evidence