2-Diazonio-1-ethoxyprop-1-en-1-olate → HCID 178438752, 화합물

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To a mixture of 3′-fluoro-4′-{[4-(cis-3-hydroxycyclobutyl)-2-methyl-5-oxo-7-propyl-4,5-dihydro[1,2,4]triazolo[1,5-a]pyrimidin-6-yl]methyl}biphenyl-2-carbonitrile (659 mg), rhodium(II) acetate (dimer) (31 mg) and methylene chloride (5 mL) was added dropwise ethyl 2-diazopropanoate (359 mg) under an argon atmosphere at 70° C., and the mixture was stirred at room temperature for 2 hr. The reaction mixture was concentrated under reduced pressure, and the residue was purified by basic silica gel chromatography [eluent: hexane/ethyl acetate=90/10→70/30 (volume ratio)] to give the title compound as a colorless amorphous compound (553 mg, 69%).

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