Step 1: 40 g of mangosteen extract plus 300 ml of dichloroethane, 300 ml of pyridine, 64 g of anhydrous aluminum trichloride and 0.1 g of sodium iodide were placed in a 1000 ml reaction flask. Heating reflux reaction for three hours. Then add 6g of concentrated hydrochloric acid to neutralize the reaction solution until the reaction solution is weakly acidic, recover the dichloroethane under reduced pressure, and leave it to cool down to obtain 30g of 1-isobaricin hydrate crude product. .
Step 2, the above steps obtained 1-isobaricin hydrate crude 30 g with 600 ml of anhydrous ethanol recrystallization, add 5 g of activated carbon decolorization, concentrated ethanol to the original volume of one-third of the original volume of the placement of the crystallization, 24 hours after filtration to obtain 98% of the 1-isobaricin hydrate boutique 21g.
