Diisopropylcarbodiimide → (3Ez,5s)-1-(biphenyl-4-ylcarbonyl)-5-[(3-methyl-1,2,4oxadiazol-5-yl)methyl]pyrrolidin-3-one o-methyloxime

関与物質

反応手順

To a solution of [(2S,4EZ)-1-biphenyl-4-ylcarbonyl)-4-(methoxyimino)pyrrolidin-2-yl]acetic acid (Intermediate 7, 50 mg, 0.14 mmol) in dichloromethane (3 ml) was added N′-hydroxyethanimidamide (12 mg, 0.16 mmol) followed by DIC (36 mg, 0.28 mmol). The reaction mixture was stirred 1 h30. The precipitate was filtered and the solution was concentrated in vacuo. Pyridine (1 ml) was added and the reaction mixture was stirred at reflux overnight The solvent was removed and dichloromethane was added. The organic phase was washed with HCl 1N then NaHCO3. The organic phase was dried (MgSO4), concentrated and purified on silica gel column chromatography (Ethyl acetate/cyclohexane, 40:60) to afford (3EZ,5S)-1-(biphenyl-4-ylcarbonyl)-5-[(3-methyl-1,2,4oxadiazol-5-yl)methyl]pyrrolidin-3-one O-methyloxime (56 mg). Yield: 91%. HPLC purity: 90%

情報源と証拠