1,1'-Carbonyldiimidazole → HCID 178426901, compound

Participants

Reaction Conditions

Reaction Steps

10-[(2-Methyl-2′-trifluoromethyl-[1,1′-biphenyl]4-yl)-carbonyl]-10,11-dihydro-5H-pyrrolo[2,1-c][1,4]benzodiazepine-3-carboxylic acid of Example 1, Step F (0.50 g, 1.02 mmol) and 1,1′-carbonyldiimidazole (0.17 g, 1.05 mmol) were dissolved in anhydrous N,N-dimethylformamide (5 mL). After stirring for 30 minutes, guanidine carbonate (0.19 g, 1.05 mmol) was added, and the reaction was heated to 100° C. for 4 hours. After cooling, the reaction mixture was diluted with water and extracted with ethyl acetate. The organic layers were combined and dried over anhydrous sodium sulfate, filtered and concentrated in vacuo to give an orange oil. Purification was achieved by preparative HPLC on a Primesphere 5 C18 (0.2×15 cm) column using a solvent gradient from 55:45:0.1 to 90:10:0.1 acetonitrile-water-trifluoroacetic acid. After removal of the acetonitrile in vacuo, the aqueous solution was neutralized with saturated aqueous sodium bicarbonate, and then extracted with ethyl acetate. The combined organic layers were dried over anhydrous sodium sulfate, filtered and concentrated in vacuo to give 0.25 g of the title compound as a white solid.

Provenance & Evidence