Preparation method of 4, 6-dibenzyl 2, 3-unsaturated glucoside

The invention discloses a preparation method of 4, 6-dibenzyl 2, 3-unsaturated glucoside. The preparation method has the characteristic that the preparation method comprises the steps of stirring and mixing 4, 6-2-O-benzyl glucose ene and dichloromethane or acetonitrile, adding the mixture in to a receptor, then conducting synthetic reaction of a rearrangement product through FeCl3/C solid catalyst and room temperature, filtering a catalyst after the reaction, concentrating and purifying the filtrate to obtain a product which is 4, 6-dibenzyl 2, 3-unsaturated glucoside. Compared with the prior art, the preparation method has the advantages that the process is simple, the operation is convenient, the production cost is low, the yield is high, the reaction condition is moderate, the use of high-toxicity chemical raw materials is avoided, the environment cannot be polluted, and the preparation method is a synthesis method of 4, 6-dibenzyl-D-glucose ene, which is environment friendly, economic and efficient, and the application scope of the substrate is wide.