Pentacyclic triterpenes. Part 3: Synthesis and biological evaluation of oleanolic acid derivatives as novel inhibitors of glycogen phosphorylase
作者:Jun Chen、Jun Liu、Luyong Zhang、Guanzhong Wu、Weiyi Hua、Xiaoming Wu、Hongbin Sun
DOI:10.1016/j.bmcl.2006.03.009
日期:2006.6
Oleanolicacid and its synthetic derivatives have been identified as novel inhibitors of glycogenphosphorylase. Within this series of compounds, 4 (IC50 = 3.3 microM) is the most potent GPa inhibitor. Preliminary structure-activity relationships of the oleanolicacid derivatives are discussed.
A series of oleanolic acid (OA) derivatives have been synthesized and their inhibitory effects on PTP1B, TCPTP and related PTPs are evaluated. Some compounds with five-membered heterocyclic ring-fused at C-2, C-3 positions showed a dramatic increase in inhibition, the two most potent PTP1B inhibitors 19 (IC50 = 0.91 mu M) and 21 (IC50 = 0.98 mu M) showed about 3-fold more potent than lead compound OA. Some C-ring modified OA analogs showed high selectivity for PTP1B over TCPTP, among them, 50 possessed the best selectivity of 6.6-fold.
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