Chloroform → HCID 69585372, compound

Participants

Reaction Steps

[5-Amino-4-(1,3-diethyl-2-oxo-2,3-dihydro-1H-benzoimidazol-5-yl)-3-m-tolyl-pyrazol-1-yl]-acetic acid tert-butyl ester is prepared according to Example 338. [5-Amino-4-(1,3-diethyl-2-oxo-2,3-dihydro-1H-benzoimidazol-5-yl)-3-m-tolyl-pyrazol-1-yl]-acetic acid tert-butyl ester (0.06 g) is diluted with 50% trifluoroacetic acid is chloroform and stirred for 5 hours. The reaction is concentrated then treated sequentially with chloroform (2 mL) 1-hydroxybenzotriazole hydrate (0.026 g), diisopropylethylamine (0.06 mL) and 1-[3-(dimethylamino)propyl]-3-ethylcarbodiimide hydrochloride (0.036 g). The mixture is allowed to stir for 20 hours, is diluted with saturated sodium bicarbonate and extracted with ethyl acetate. After concentration the product is purified on silica gel to give 1,3-Diethyl-5-(2-oxo-6-m-tolyl-2,3-dihydro-1H-imidazo[1,2-b]pyrazol-7-yl)-1,3-dihydro-benzoimidazol-2-one.

Provenance & Evidence