1-Ethyl-3-(3'-dimethylaminopropyl)carbodiimide → (S)-N-(1-(3-(3-chloro-4-cyano-5-fluorophenyl)-1H-pyrazol-1-yl)propan-2-yl)-3-(1-trityl-1H-imidazol-4-yl)-1,2,4-oxadiazole-5-carboxamide

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Reaction Steps

Into a flask containing 3-(1-trityl-1H-imidazol-4-yl)-1,2,4-oxadiazole-5-carboxylic acid (0.148 g, 0.350 mmol) and anhydrous HOBt (0.047 g; 0.350 mmol), dichloromethane (2 ml), DIPEA (0.122 ml; 0.700 mmol) and EDCI (0.067 g; 0.350 mmol) were added and stirred for 10 min at RT. (S)-4-(1-(2-aminopropyl)-1H-pyrazol-3-yl)-2-chloro-6-fluorobenzonitrile (0.100 g, 0.269 mmol) dissolved in 2 ml of dichloromethane was added and the resulting mixture stirred overnight. Next day the temperature was raised to 50° C. and more EDCI (0.067 g; 0.350 mmol) was added. The reaction mixture was allowed to react with stirring for 4 h. DCM was added and the organic layer was extracted with 1M Na2CO3 and water. The organic layer was then evaporated and the residue purified with flash chromatography. LC-MS: [M+1]=684.133.

Provenance & Evidence