1,1'-Carbonyldiimidazole → HCID 59909802, compound

Participants

Reaction Steps

A solution of (2R)-2-[2-(tert-butoxy)-2-oxoethyl]-5-cyclohexylpentanoic acid (Preparation 1) (300 mg, 1.00 mmol) in dichloromethane (15 ml) was treated with 1,1′-carbonyldiimidazole (162 mg, 1.00 mmol) and the solution was stirred at room temperature for 2 hours. 2-(4-chlorophenoxy)-N′-hydroxyethanimidamide (U.S. Pat. No. 97-815671 970313) (197 mg, 0.98 mmol) was then added and the mixture was stirred for 17 hours. The solvent was removed under reduced pressure and the residue was heated neat at 120° C. under a nitrogen atmosphere for 2 hours. The crude product was then purified by column chromatography on silica gel eluting with dichloromethane:methanol (99:1) to afford the title compound as a colourless oil (220 mg).

Provenance & Evidence