反应详情

A room temperature solution of 5.04 gms. 4-nitro-benzoic acid in tetrahydrofuran (10 mL) is treated with 5.14 gms. 1′,1′-carbonyl-diimidizole and immediately immersed in an ice bath. The reaction mixture is stirred in the ice bath for 30 minutes, then it is allowed to warm to room temperature. Once at room temperature the reaction mixture is treated with 3 mL piperidine. The reaction mixture is allowed to stir at room temperature ovenight. The reaction is then made basic with the addition of saturated aqueous sodium bicarbonate solution, and the resulting mixture is extracted with ethyl acetate. The organics are separated, dried over anhydrous sodium sulfate, and subsequently evaporated to dryness in vacuo. The crude product residue is then chromatographed by flash silica gel chromatography using 50% ethyl acetate in hexanes as the eluant. Following evaporation of solvent, 1-(4-nitrobenzoyl)piperidine is isolated as a white solid in the amount of 5.87 gms.

1. customA room temperature solution of 5.04 gms
2. custom1′,1′-carbonyl-diimidizole and immediately immersed in an ice bath
3. extractionthe resulting mixture is extracted with ethyl acetate
4. customThe organics are separated
5. dry with materialdried over anhydrous sodium sulfate
6. customsubsequently evaporated to dryness in vacuo
7. customThe crude product residue is then chromatographed by flash silica gel chromatography
8. customevaporation of solvent