1,1'-Carbonyldiimidazole → tert-butyl (3R)-6-cyclohexyl-3-(3-methyl-1,2,4-oxadiazol-5-yl)hexanoate

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반응 단계

A solution of (2R)-2-[2-(tert-butoxy)-2-oxoethyl]-5-cyclohexylpentanoic acid (Preparation 1) (596 mg, 2.00 mmol) in dichloromethane (8ml) was treated with 1,1′-carbonyldiimidazole (364 mg, 2.25 mol) and the solution was stirred at room temperature for 15 minutes. The N-hydroxyacetamidine (Chem.Ber.; 17; 1884; 2746) (148 mg, 2.00 mmol) was then added and the mixture was stirred for 1 hour. The solvent was removed under reduced pressure and the residue was heated neat under a nitrogen atmosphere for 90 minutes. The crude product was then purified by column chromatography on silica gel eluting with dichloromethane to afford the title compound (385 mg).

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