Carbon tetrabromide → HCID 67958791, compound

Participants

Reaction Conditions

Reaction Steps

To a 100 mL flask with 3-{4-(2-Chloro-phenyl)-5-[5-(2,2,2-trifluoro-ethoxy)-pyridin-2-yl]-4H-[1,2,4]triazol-3-yl}-acrylic acid 8 (0.18 g, 0.368 mmol) in dichloromethane (20 mL) was added oxalyl chloride (0.20 g, 1.55 mmol) and a drop of DMF. The reaction was kept at ambient temperature for 3 h. The solvent was removed and the residue was further dried under high vacuum and cooled to −20° C. Dichloromethane (10 mL) was added, followed by 4-Cyano-benzoic acid hydrazide (0.18 g, 1.1 mmol) and triethylamine (0.5 mL). The reaction mixture was kept at this temperature for 0.5 h and then ambient temperature for 1 h. The solvent was removed and the crude 4-Cyano-benzoic acid N′-(3-{4-(2-chloro-phenyl)-5-[5-(2,2,2-trifluoro-ethoxy)-pyridin-2-yl]-4H-[1,2,4]triazol-3-yl}-acryloyl)-hydrazide was used for the next step. 4-Cyano-benzoic acid N′-(3-{4-(2-chloro-phenyl)-5-[5-(2,2,2-trifluoro-ethoxy)-pyridin-2-yl]-4H-[1,2,4]triazol-3-yl}-acryloyl)-hydrazide was dissolved in dichloromethane (10 mL) and triphenylphosphine (0.19 g, 0.736 mmol), carbon tetrabromide (0.24 g, 0.736 mmol) and triethylamine (0.18 mL, 1.30 mmol) were added. The reaction mixture was kept at ambient temperature for 2 h. The final compound was purified by column chromatography (eluting with hexane and ethyl acetate 1:3) to give 4-[5-(2-{4-(2-Chloro-phenyl)-5-[5-(2,2,2-trifluoro-ethoxy)-pyridin-2-yl]-4H-[1,2,4]triazol-3-yl}-vinyl)-[1,3,4]oxadiazol-2-yl]-benzonitrile as a yellow solid. Yield: 0.07 g, 30%.

Provenance & Evidence