Diisopropylethylamine → (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 carbamoylmethyl-amide

Participants

Reaction Steps

(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 (see Example 5) (0.25 g, 0.435 mmol) was dissolved in a mixture of CH2Cl2 (10 mL) and DMF (0.2 mL). To this solution, were added glycinamide hydrochloride (0.072 g, 0.653 mmol), TBTU (0.21 g, 0.653 mmol), and DIPEA (0.19 mL, 1.087 mmol). The reaction mixture was stirred at room temperature for 1 h. The reaction mixture was diluted with CH2Cl2 and washed with 1N HCl followed by saturated aq. NaHCO3. The organic phase was dried over Na2SO4 and concentrated. The crude product was purified by silica gel preparative thin layer chromatography using CH2Cl2-MeOH (95:5) as an eluent to afford 0.155 g of the title compound as a white foam (M+1, 630).

Provenance & Evidence