Triethylamine → n-Galactosylgeranamide

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To a THF (20 ml) solution containing geranic acid (0.84 g, 5 mmols), triethylamine (0.51 g, 5 mmols) was added and cooled to 0° C., into which a THF (5 ml) solution containing isobutyl chloroformate (0.68 g, 5 mmols) was added dropwise, followed by 30 minutes' stirring at 0° C. Then galactosamine hydrochloride (1.08 g, 5 mmols) was dissolved in 10 ml of water, to which 5 ml of 1N sodium hydroxide was further added, and the solution was added to the reaction mixture all at a time. After the following stirring for an hour at 0° C. and for further 4 hours at room temperature, the reaction mixture was condensed under reduced pressure. To the residue 150 ml of acetone was added and precipitated sodium chloride was filtered off. The filtrate was condensed once again and the residue was separated on silica gel column chromatography. Consequently the product was obtained from the hexane-ethanol (2:1) distillate as a viscous oily substance, to which a minor amount of ether was added to crystallize the product. Through subsequent suction filtration, 0.754 g of the title compound was obtained. The yield was 46%, and the melting point was 85-87° C.

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