Toluene → HCID 10188276, compound

Participants

Reaction Conditions

Reaction Steps

A mixture that consists of 54.1 g (100 mmol) of 2,3,4,6-tetra-O-pivaloyl-glucopyranose, 1.39 g (5 mmol) of tetrabutylammonium chloride and 11.22 g of potassium-t-butoxide (100 mmol) in 500 ml of dimethylacetamide is cooled to 0° C. At 0° C., 34.36 g (150 mmol) of 2-bromoacetic acid benzyl ester is added in drops over 20 minutes while being stirred vigorously. It is stirred for one hour at 0° C. Then, 250 ml of toluene is added thereto, solid is filtered out, it is evaporated to the dry state in a vacuum, the residue is taken up in 500 ml of ethanol, mixed with 5 g of palladium (10%) on activated carbon and hydrogenated until the hydrogen absorption is completed. Catalyst is filtered out, it is rewashed with a little ethanol and the combined organic solutions are evaporated to the dry state in a vacuum. The residue is chromatographed on silica gel (mobile solvent: dichloromethane/n-hexane/ethanol/acetic acid=20:5:3:0.5). The product-containing fractions are concentrated by evaporation, dissolved in 400 ml of ethyl acetate and shaken out three times with 200 ml of water. Then, the organic phase is separated and evaporated to the dry state in a vacuum.

Provenance & Evidence