Pyruvic Acid → HCID 12083934, compound

Participants

Reaction Conditions

Reaction Steps

To a solution of H-Pro-OBn.HCl (10.0 g, 41.3 mmol) in anh DMF (50 mL) at 0° C. under Ar, NMM (4.55 mL, 43.8 mmol) was added dropwise by syringe while maintaining the temperature at 0° C. HOBt (18.98 g, 124 mmol) was then added in portions. After 15 min, pyruvic acid (8.61 g, 97.79 mmol) dissolved in anh DCM (10 mL) was added dropwise by syringe while maintaining the temperature below 3° C. Finally, DCC (22.17 g, 107.46 mmol) dissolved in DCM (80 mL) was added dropwise with a compensated funnel. The mixture was allowed to reach room temperature (2 h) and stirred for another 12 h. The reaction mixture was filtered to remove the precipitate and the solution was concentrated under reduced pressure. The residue was dissolved in EtOAc (500 mL) and washed successively with aq. KHSO4 (100 mL, 10%), aq. NaHCO3 (400 mL, sat.), brine (400 mL), dried (Na2SO4) and filtered. The solvent was eliminated under reduced pressure and the residue was chased with ACN (100 mL), cooled at −30° C. for 2 h and filtered to removed the excess of N,N-dicyclohexylurea. The resulting brown oil (15.82 g) was purified by flash LC (silica gel, grad. hex to hex:EtOAc 2:1) to afford F2 (9.06 g, 66% yield) as a white solid. Rf=0.25 (hex:EtOAc 2:1).

Provenance & Evidence