Water → HCID 58654355、化合物

A catalytic amount of dichloropalladium(II)bis(triphenylphosphine) (189 mg, 268 μmol) was added to a solution of 5-chloro-3-imidazol-1-yl-[1,2,4]thiadiazole (500 mg, 2.68 mmol) and tributyl-(1-ethoxy-vinyl)-stannane (904 μL, 2.68 mmol) in DMF (10 mL) under a nitrogen atmosphere at r.t. prior to heating at 65-70° C. for 21 h. The reaction was then cooled to r.t., H2O (70 mL) was added, filtered through celite, and washed with EtOAc (200 mL). The organic layer was separated, dried over Na2SO4, filtered and concentrated to a yellow residue. The yellow residue was diluted with a 5:1 mixture of 5N HCl/THF (48 mL) and stirred at r.t. for a period of 2 hours prior to concentrating to a white residue. The crude product was diluted with EtOAc (100 mL), washed with 1M NaOH (75 mL), brine (75 mL), dried over Na2SO4, filtered and concentrated to a white solid. Purification was achieved using column chromatography (CH2Cl2 to 9:1 CH2Cl2/MeOH) to afford 398 mg (77%) of 1-(3-imidazol-1-yl-[1,2,4]thiadiazol-5-yl)-ethanone as a white solid. [M+H]+ 195.35.