Structure–activity study of epi-gallocatechin gallate (EGCG) analogs as proteasome inhibitors
摘要:
The structure-activity relationship of a number of synthetic green tea polyphenol analogs involving modifications of A ring and B ring of epi-gallocatechin gallate (EGCG) as proteasome inhibitors has been examined. It was found that in B ring, a decrease in the number of OH groups led to decreased potency. Introduction of a hydrophobic benzyl group into the 8 position of A ring did not significantly affect the proteasome-inhibitory potency. (c) 2005 Elsevier Ltd. All rights reserved.
Asymmetric total synthesis of B-ring modified (−)-epicatechin gallate analogues and their modulation of β-lactam resistance in Staphylococcus aureus
摘要:
Two enantiomerically pure B-ring modified analogues of (-)epicatechin gallate were synthesised and their modulation of beta-lactam resistance using three strains of methicillin resistant Staphylococcus aureus (BB 568, EMRSA-15 and EMRSA-16) evaluated. Sub-inhibitory concentrations (12.5 and 25 mg/L) of the two analogues fully sensitised each of the three MRSA strains to oxacillin, reducing the MIC to less than 0.5 mg/L, identical to levels achieved with ECg. Lower concentrations demonstrated that the position and degree of hydroxylation of the B-ring is important for activity. (c) 2005 Elsevier Ltd. All rights reserved.
Asymmetric total synthesis of B-ring modified (−)-epicatechin gallate analogues and their modulation of β-lactam resistance in Staphylococcus aureus
作者:James C. Anderson、Catherine Headley、Paul D. Stapleton、Peter W. Taylor
DOI:10.1016/j.tet.2005.05.086
日期:2005.8
Two enantiomerically pure B-ring modified analogues of (-)epicatechin gallate were synthesised and their modulation of beta-lactam resistance using three strains of methicillin resistant Staphylococcus aureus (BB 568, EMRSA-15 and EMRSA-16) evaluated. Sub-inhibitory concentrations (12.5 and 25 mg/L) of the two analogues fully sensitised each of the three MRSA strains to oxacillin, reducing the MIC to less than 0.5 mg/L, identical to levels achieved with ECg. Lower concentrations demonstrated that the position and degree of hydroxylation of the B-ring is important for activity. (c) 2005 Elsevier Ltd. All rights reserved.
Structure–activity study of epi-gallocatechin gallate (EGCG) analogs as proteasome inhibitors
作者:Sheng Biao Wan、Kristin R. Landis-Piwowar、Deborah J. Kuhn、Di Chen、Q. Ping Dou、Tak Hang Chan
DOI:10.1016/j.bmc.2004.12.056
日期:2005.3
The structure-activity relationship of a number of synthetic green tea polyphenol analogs involving modifications of A ring and B ring of epi-gallocatechin gallate (EGCG) as proteasome inhibitors has been examined. It was found that in B ring, a decrease in the number of OH groups led to decreased potency. Introduction of a hydrophobic benzyl group into the 8 position of A ring did not significantly affect the proteasome-inhibitory potency. (c) 2005 Elsevier Ltd. All rights reserved.