Halogen-substituted (C-β-d-glucopyranosyl)-hydroquinone regioisomers: Synthesis, enzymatic evaluation and their binding to glycogen phosphorylase
作者:Kyra-Melinda Alexacou、Yun Zhi Zhang、Jean-Pierre Praly、Spyros E. Zographos、Evangelia D. Chrysina、Nikos G. Oikonomakos、Demetres D. Leonidas
DOI:10.1016/j.bmc.2011.07.024
日期:2011.9
(4, 5) or para (3, 16) halohydroquinones were evaluated as inhibitors of glycogen phosphorylase (GP, a molecular target for inhibition of hepatic glycogenolysis under high glucose concentrations) by kinetics and X-ray crystallography. These compounds are competitive inhibitors of GPb with respect to α-d-glucose-1-phosphate. The measured IC50 values (μM) [169.9 ± 10.0 (3), 95 (4), 39.8 ± 0.3 (5) 136
的电卤化Ç - (2,3,4,6-四- ø -乙酰基β- d吡喃葡萄糖基)-1,4-二甲氧基苯(1区域选择性地得到产品的卤化)对位位置到d -glucosyl部分(8,9)被脱乙酰化为3(氯化物)和16(溴化物)。为了制备间位异构体,用CAN有效地氧化1以提供C-(2,3,4,6-四-O-乙酰基-β- d-吡喃葡萄糖基)1,4-苯醌2,在MeOH或H中2 O-THF含有很少当量的AcCl,加入盐酸后主要生成间位(相对于糖部分而言)氯化氢醌衍生物5和18,后者被脱乙酰基化为4。脱乙酰化的元(4,5)或对位(3,16)halohydroquinones评价为通过动力学和X-射线晶体学糖原磷酸化酶(GP,对于在高葡萄糖浓度肝糖原分解的抑制的分子靶标)的抑制剂。这些化合物相对于α- d是GPb的竞争性抑制剂-葡萄糖-1-磷酸。所测量的IC 50值(μM)[169.9±10.0(3),95(4),39