反应详情

To a solution of 2.5 g. of 7-cyanomethylthioacetamido-3-cephem-3ol-4-carboxylic acid p-nitrobenzyl ester in 25 ml. of dry dimethylacetamide is added 1 ml. of propylene oxide and one equivalent of methanesulfonyl chloride. After stirring for 4 hours, the mixture is taken up in ethyl acetate and washed with saturated sodium chloride solution. Solvent is removed from the ethyl acetate solution under reduced pressure and the residue is purified by thin layer chromatography yielding the product 7-cyanomethylthioacetamido-3-methylsulfonyloxy-3-cephem-4-carboxylic acid p-nitrobenzyl ester as an amorphous solid.

1. washwashed with saturated sodium chloride solution
2. customSolvent is removed from the ethyl acetate solution under reduced pressure
3. customthe residue is purified by thin layer chromatography