Fifty-seven derivatives of glycyrrhetinic acid (GA) were synthesized, and their anti-hepatitis B virus (HBV) activity was evaluated in HepG 2.2.15 cells. Among them, sixteen compounds showed greater anti-HBV activity than GA, especially, compounds 29, 32, 35, 41 exhibited significantly inhibitory activities against HBV DNA replication with IC50 values of 5.71, 5.36, 8.90 and 9.08 mu M, respectively. The structure-activity relationships (SARs) of GA derivatives were discussed for exploring novel anti-HBV agents. (C) 2012 Elsevier Ltd. All rights reserved.
Synthesis and proteasome inhibition of glycyrrhetinic acid derivatives
This study discovered that glycyrrhetinic acid inhibited the human 20S proteasome at 22.3 mu M. Esterification of the C-3 hydroxyl group on glycyrrhetinic acid with various carboxylic acid reagents yielded a series of analogs with marked improved potency. Among the derivatives, glycyrrhetinic acid 3-O-isophthalate (17) was the most potent compound with IC50 of 0.22 mu M, which was approximately 100-fold more potent than glycyrrhetinic acid. (c) 2008 Elsevier Ltd. All rights reserved.
Synthesis and in vitro/in vivo anticancer evaluation of pentacyclic triterpenoid derivatives linked with -phenylalanine or -proline
Extensive research effort has been put in pentacyclic triterpenoids due to their numerous biological activities. However, their poor water solubility and low oral bioavailability limit their antitumor effects in vivo. To address these issues, 37 triterpenoid acid derivatives linked to l-phenylalanine or l-proline were designed and synthesized in this study. Structure-activity relationship (SAR) studies