Triethylamine → (S)-1-[(R)-5-(4-cyano-benzyl)-7-(3,5-dichloro-phenyl)-5-methyl-6-oxo-6,7-dihydro-5H-imidazo[1,2-a]imidazole-3-sulfonyl]-pyrrolidine-2-carboxylic acid (2-hydroxy-ethyl)-amide

Participants

Reaction Steps

The above amine HCl salt (0.93 g) was dissolved in anhydrous DMF (9 mL) by vigorously stirring at room temperature for 30 min. When all the amine salt was dissolved, triethylamine (1 mL) was added to the solution. (R)-5-(4-Cyano-benzyl)-7-(3,5-dichloro-phenyl)-5-methyl-6-oxo-6,7-dihydro-5H-imidazo[1,2-a]imidazole-3-sulfonyl chloride (see Example 5) (1.18 g) in anhydrous DMF (1 mL) was then added to the reaction mixture and stirred at room temperature for 30 min. The reaction mixture was then diluted with EtOAc and washed with water (×2), 1N HCl, saturated NaHCO3 and brine. The organic phase was then dried over Na2SO4 and concentrated. The residue was purified by silica gel column chromatography using CH2Cl2 and MeOH (gradient 0-5% MeOH) as an eluent to afford 1.18 g of the title compound as a white foam (M+1, 617.2)

Provenance & Evidence