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Maslinic acid (1) and oleanolic acid (2) were isolated from Olea europaea L. under ultra-sonication conditions with large amounts (8.5 and 3.4mg/g DW, respectively). Copper-catalyzed microwave-assisted 1,3-dipolar cycloaddition reactions between natural pentacyclic triterpenoid-alkyne derivatives and a series of aryl nitrile oxides, regiospecifically afforded 3,5-disubstituted isoxazoles in quantitative...
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