Propiolic Acid → tert-Butyl ((S)-1-(((S)-3,3-dimethyl-1-oxo-1-((2S,4S)-4-propiolamido-2-(((R)-1,2,3,4-tetrahydronaphthalen-1-yl)carbamoyl)pyrrolidin-1-yl)butan-2-yl)amino)-1-oxopropan-2-yl)(methyl)carbamate

Participants

Reaction Steps

To a solution of propiolic acid (0.06 mL, 0.90 mmol) in DMF (2 mL) at 0° C. was added HATU (123 mg, 0.32 mmol) followed by tert-butyl ((S)-1-(((S)-1-((2S,4S)-4-amino-2-(((R)-1,2,3,4-tetrahydronaphthalen-1-yl)carbamoyl)pyrrolidin-1-yl)-3,3-dimethyl-1-oxobutan-2-yl)amino)-1-oxopropan-2-yl)(methyl)carbamate (100 mg, 0.18 mmol) and DIEA (0.06 mL, 0.36 mmol). The reaction mixture was stirred at rt for 1 h and diluted with ethyl acetate and brine. The organic layer was separated, washed with aq. NaHCO3 solution, dried over MgSO4 and concentrated in vacuo. The residue was purified by flash column chromatography (eluting with 90% EtOAc/hexane) to afford the title compound as a white solid (76 mg, 70%). 1H NMR (CDCl3) δ 8.60 (d, J=6.6 Hz, 1H), 7.85 (d, J=8.6 Hz, 1H), 7.25 (m, 1H), 7.16-6.98 (m, 3H), 5.23-5.08 (m, 1H), 4.73 (d, J=8.8 Hz, 1H), 4.63-4.48 (m, 1H), 4.32 (d, J=8.6 Hz, 1H), 3.96 (dd, J=10.9, 5.0 Hz, 1H), 3.75 (d, J=11.0 Hz, 1H), 2.80-2.70 (m, 5H), 2.43 (d, J=13.9 Hz, 1H), 2.18 (ddd, J=14.0, 8.9, 6.4 Hz, 1H), 2.06-1.94 (m, 1H), 1.91-1.80 (m, 4H), 1.46 (s, 10H), 1.30-1.25 (m, 3H), 0.76 (s, 9H); MS(ESI+) m/z 610.4 (M+H)+.

Provenance & Evidence