反应详情

To a stirred solution of 24.9 g. (0.01 mol.) of N-carbobenzoxy-DL-proline and 11.22 g. (0.11 mol.) of n-hexanol in 200 ml. of dry dimethylformamide and 7.9 g. pyridine at room temperature is added 20.6 g. (0.01 mol.) of N,N'-dicyclohexylcarbodiimide. After stirring this mixture at room temperature for 16 hours, the precipitated N,N'-dicyclohexylurea is filtered off, the filtrate is diluted with a large volume of saturated aqueous sodium chloride, and this is thoroughly extracted with chloroform. The combined extracts are dried and concentrated in vacuo to give an oil comprising 1-(benzyloxy)carbonyl)]-2-[(hexyloxy)carbonyl]pyrrolidine.

1. filtrationthe precipitated N,N'-dicyclohexylurea is filtered off
2. additionthe filtrate is diluted with a large volume of saturated aqueous sodium chloride
3. extractionthis is thoroughly extracted with chloroform
4. customThe combined extracts are dried
5. concentrationconcentrated in vacuo