L-Alanine → 2-{{2-Chloro-5-[3,6-dihydro-3-methyl-2,6-dioxo-4-(trifluoromethyl)-1(2H)-pyrimidinyl]-4-fluoro-phenyl}imino}-alpha-methyl-4-oxo-3-thiazolidineacetic acid

Participants

Reaction Steps

An alanine substituted resin (1.0 mmol) which is N-protected with Fmoc and supported on polystyrene (commercially available as Fmoc-gly-Wang resin from Midwest Bio-tech Inc., Fishers, Ind.) is treated with a 20% piperdine in N,N-dimethylformamide solution to remove the Fmoc protecting group. The solvents are removed and the resin is washed with N,N-dimethylformamide, methanol and methylene chloride, treated with a solution of 2-chloro-5-[3,6-dihydro-3-methyl-2,6-dioxo-4-(trifluoromethyl)-1(2H)-pyrimidinyl]-4-fluorophenyl isothiocyanate (0.57 g, 1.5 mmol) in methylene chloride, and stirred at room temperature for 6 hours. The solvents are removed and the resin is washed with N,N-dimethylformamide, methanol and methylene chloride, diluted with N,N-dimethylformamide, treated with methyl bromoacetate (0.46 g, 3 mmol) and N,N-diisopropylethylamine (1 ml), and stirred overnight at room temperature. The solvents are removed and the resultant resin is washed sequentially with N,N-dimethylformamide, methanol and methylene chloride, air-dried, and cleaved with trifluoroacetic acid. Column chromatography of the resultant reaction mixture using silica gel and a 15% methanol in methylene chloride solution gives the title product (0.55 g) which is identified by 1H and 13C NMR spectral analyses.

Provenance & Evidence