Trifluoroacetic acid → [(2,5-dioxo-1-imidazolidinyl)methyl][(RS)-4-methyl-2-[[(S)-3-methyl-1-(methylcarbamoyl)butyl]carbamoyl]pentyl]phosphinic acid

Participants

Reaction Steps

60 mg (0.13 mmol) of [(2,5-dioxo-1-imidazolidinyl)methyl][(RS)-4-methyl-2-[[(S)-3-methyl-1-(methylcarbamoyl)butyl]carbamoyl]pentyl]phosphinic acid ethyl ester were dissolved in 1 ml of dichloromethane and the solution was stirred at room temperature for 3 hours in the presence of 1 ml of bromotrimethylsilane and 0.1 ml of trifluoroacetic acid. The solvent was removed by evaporation. The residue was treated three times with acetone/water (9:1) and the solvent was removed by evaporation each time. Finally, the product was triturated with diethyl ether to yield 55 mg of [(2,5-dioxo-1-imidazolidinyl)methyl][(RS)-4-methyl-2-[[(S)-3-methyl-1-(methylcarbamoyl)butyl]carbamoyl]pentyl]phosphinic acid in the form of a foam.

Provenance & Evidence