反应详情

温度

25 °C

To a water cooled (25° C.) solution of 10.0 g of (R)-2-(hydroxymethyl)-1-pyrrolidinecarboxylic acid, 1,1-dimethylethyl ester in 250 ml of dry methylene chloride is added in one portion 16.0 g of pyridinium chlorochromate, 36.0 g of dried, crushed 4Å molecular sieves and 4.5 ml of glacial acetic acid. The resulting mixture is stirred at 25° C. for one hour. Twenty-five grams of diatomaceous earth and 500 ml of diethyl ether is added, the suspension is filtered through a pad of diatomaceous earth and the filtrate concentrated in vacuo. The residue is dissolved in diethyl ether and is passed through a short column of silica gel using diethyl ether as the eluant. The first two 500 ml fractions contain the desired aldehyde. The solvent is concentrated in vacuo to give 10.1 g of desired product.

1. custom36.0 g of dried
2. customcrushed 4Å molecular sieves and 4.5 ml of glacial acetic acid
3. additionTwenty-five grams of diatomaceous earth and 500 ml of diethyl ether is added
4. filtrationthe suspension is filtered through a pad of diatomaceous earth
5. concentrationthe filtrate concentrated in vacuo
6. dissolutionThe residue is dissolved in diethyl ether
7. concentrationThe solvent is concentrated in vacuo