tyrosinase inhibitory activity was evaluated. The half maximal inhibitory concentration (IC50) of 1-3 could not be determined even when the concentration was increased to 1000 μM. Contrastingly, glycosides 4-7, missing methyl and benzoyl groups, acted as tyrosinase inhibitors with IC50s of 417 μM, 852 μM, 623 μM, and 657 μM, respectively. Among these novel inhibitors, derivative 4 was the most potent
                                    异
黄酮苷(1)及其相关的
天然产物2分别从异黄杨和普罗梯亚木中分离出来,并归类为实际应用的
酪氨酸酶抑制剂熊果苷(3)的类似物。作为关键步骤,通过施密特糖基化合成了
天然产物和几种衍
生物,如
葡糖苷4,
木糖苷5,
纤维二糖苷6和
麦芽糖苷7,并评估了它们对
酪氨酸酶的抑制活性。即使将最大抑制浓度(IC50)增加到1000μM,也无法确定。相反,缺少甲基和苯甲酰基的糖苷4-7充当
酪氨酸酶抑制剂,IC50分别为417μM,852μM,623μM和657μM。在这些新型
抑制剂中,衍
生物4最有效,