L-Phenylalanine → N-(2,4-Dinitrophenyl)-L-phenylalanine

Participants

Reaction Steps

To a mixture of L-phenylalanine (8.88 g, 53.7 mmol) and 1-fluoro-2,4-dinitrobenzene (3.24 ml, 26.9 mmol) was added triethylamine (7.86 ml, 56.4 mmol). The resulting mixture was warmed using a Biotage Initiator microwave to 100° C. for 4 min. The solid was diluted with MeOH and the slurry was dropped into distilled water. Dichloromethane was added to the slurry and the organic phase was separated. The organic phase was further extracted with 1.2 M hydrogen chloride solution and brine. The organic phase was dried over Na2SO4, filtered and the solvents were evaporated. The residue was diluted with dichlormethane and the slurry was filtered. The precipitate was then washed with a small amount of dichlormethane. The combined filtrates were evaporated and the residue was purified by flash chromatography using a dichloromethane/methanol gradient (0% to 5%) to afford the title compound.

Provenance & Evidence