Water → methyl 2,3,4,6-tetra-O-benzyl-alpha-D-glucopyranoside

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Reaction Steps

Methyl-α-D-glucopyranoside 9 (75 g) is dissolved in benzyl chloride (400 mL). To this solution is added potassium hydroxide (250 g). The resulting suspension is heated at 100° C. (water bath temp.) with stirring (mechanical) for 4 h, then cooled to r.t. The mixture is washed with saturated NaCl in ether (500 mL) and dried with MgSO4. The ether is evaporated. The residue is distilled under vacuum (~0.1 mm Hg) at a temperature of 120° C. until no more distillate is collected or the temperature at the distilling head begins to fall. The pot residue is used for the next reaction without further purification.

Provenance & Evidence