Potassium Carbonate → HCID 10231749, compound

Participants

Reaction Conditions

Reaction Steps

A mixture that consists of 51.66 g (100 mmol) of 2,3,4,6-tetra-O-pivaloyl-mannopyranose, 0.55 g (5 mmol) of tetramethylammonium chloride and 82.93 g (600 mmol) of fine-powder potassium carbonate in 350 ml of diethylene glycol dimethyl ether is cooled to 10° C. At 10° C., 36.65 g (160 mmol) of 2-bromoacetic acid benzyl ester is added in drops within 10 minutes while being stirred vigorously. It is stirred for two hours at 10° C. 250 ml of MTB (methyl-tert-butyl ether) is added, solid is filtered out, and the filtrate 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 hydrogen absorption is completed. Catalyst is filtered out, it is rewashed with ethanol, and the combined 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