Synthesis and structure–activity relationships of novel, substituted 5,6-dihydrodibenzo[a,g]quinolizinium P2X7 antagonists
摘要:
Iminium quaternary protoberberine alkaloids (QPA) have been found to be novel P2X(7) antagonists. To assess their structure-activity relationships, these compounds were modified at their R-1 and R-2 groups and assayed for their ability to inhibit the 2'(3')-O-(4-benzoylbenzoyl)-ATP (BzATP)-induced uptake of fluorescent ethidium by HEK-293 cells stably expressing the human P2X(7) receptor, and their ability to inhibit BzATP-induced IL-1 beta release by differentiated THP-1 cells. Compounds 15a and 15d, with alkyl groups at the R-1 position, and especially compound 19h, with the 2-NO2-4,5-dimethoxy-benzyl group at the R-2 position, had potent inhibitory efficacy as P2X(7) antagonists. (C) 2008 Elsevier Ltd. All rights reserved.
The invention provides novel compounds of formula (I)
or a pharmaceutically acceptable salt thereof, wherein R
1
to R
7
are as described herein, compositions including the compounds and methods of preparing and using the compounds.
A compound of formula (I) or a pharmaceutically acceptable salt thereof, wherein R1 to R7 have the significance given in claim 1, can be used in the form of a pharmaceutical composition.
Syntheses and absorption spectra of some compounds with the berbine structure
作者:S. Pavelka、J. Kovář
DOI:10.1135/cccc19763654
日期:——
Antibacterial activity and structure-activity relationships of berberine analogs
作者:K Iwasa、M Kamigauchi、M Ueki、M Taniguchi
DOI:10.1016/0223-5234(96)85167-1
日期:1996.1
Analogs of berberine 1 and related compounds were prepared to evaluate structure-activity relationships. Among the 13-alkyl-substituted and the 13-unsubstituted protoberberinium salts, the 13-ethyl-9-ethoxyl homolog 30, the 13-ethyl analog 29, and the 13-methyl derivative 3 showed an increase in antibacterial activity against Staphylococcus aureus by eight-, four- and twofold respectively over the parent base berberine 1; this is suggestive that steric effects play a significant role in the antibacterial. activity. Reduction of the protoberberinium salts yielding the tetrahydro derivatives greatly reduced the antibacterial activity. Replacement of methoxyl groups at the C-2 and the C-3 of ring A by a methylenedioxy group resulted in increased antibacterial activity. These data strongly suggest that the quaternary nitrogen atom such as in protoberberinium salts, an alkylsubstituent at C-13, and a methylenedioxy function at C-2 and C-3 are required for enhanced activity. Tetrahydroprotoberberine alpha-N-metho salts showed higher activity than tetrahydroprotoberberine hydrochlorides, but appreciably lower activity than protoberberinium salts. The effects of substitution at C-13 and on ring A in the alpha-N-metho salt were similar to those in protoberberinium salts. Stereochemical changes of the B/C ring juncture from trans to cis, and of the methyl group at C-13 from alpha to beta, had, respectively, marked and slight effects on the activity. The tested compounds were less active against Escherichia coli (Gram-negative bacterium) and Candida albicans (fungus) than S aureus (Gram-positive bacterium).
Synthesis and structure–activity relationships of novel, substituted 5,6-dihydrodibenzo[a,g]quinolizinium P2X7 antagonists
作者:Ga Eun Lee、Ho-Sung Lee、So Deok Lee、Jung-Ho Kim、Won-Ki Kim、Yong-Chul Kim
DOI:10.1016/j.bmcl.2008.11.088
日期:2009.2
Iminium quaternary protoberberine alkaloids (QPA) have been found to be novel P2X(7) antagonists. To assess their structure-activity relationships, these compounds were modified at their R-1 and R-2 groups and assayed for their ability to inhibit the 2'(3')-O-(4-benzoylbenzoyl)-ATP (BzATP)-induced uptake of fluorescent ethidium by HEK-293 cells stably expressing the human P2X(7) receptor, and their ability to inhibit BzATP-induced IL-1 beta release by differentiated THP-1 cells. Compounds 15a and 15d, with alkyl groups at the R-1 position, and especially compound 19h, with the 2-NO2-4,5-dimethoxy-benzyl group at the R-2 position, had potent inhibitory efficacy as P2X(7) antagonists. (C) 2008 Elsevier Ltd. All rights reserved.