CERTAIN CHEMICAL ENTITIES, COMPOSITIONS, AND METHODS
申请人:Qian Xiangping
公开号:US20120052019A1
公开(公告)日:2012-03-01
Chemical entities which are triterpenoid derivatives, pharmaceutical compositions and methods of treatment of inflammatory, neurodegenerative, neoplastic and autoimmune diseases are described.
本文描述了三萜类衍生物、制药组合物以及治疗炎症、神经退行性、肿瘤和自身免疫性疾病的方法。
Iguesterin, a new quinonoid triterpene from Catha cassinoides
作者:Antonio G. González、Cosme G. Francisco、Raimundo Freire、Rosendo Hernández、José A. Salazar、Ernesto Suárez
DOI:10.1016/0031-9422(75)85188-0
日期:1975.4
Abstract β-Amyrin, sitosterol, celastrol, pristimerin, tingenone and a new hydroxymethylene quinonoid dinor-triterpene iguesterine were isolated from the root bark of Cathacassinoides. The structure of iguesterine was determined spectroscopically and by synthesis from tingenone. Tentative assignments are given for the chemical shifts of the methyl groups of iguesterin, tingenone and some of their derivatives
Two new triterpene dimers from Celastraceae, their partial synthesis and antimicrobial activity
作者:Antonio G. González、JoséS. Jiménez、Laila M. Moujir、Angel G. Ravelo、Javier G. Luis、Isabel L. Bazzocchi、Angel M. Gutiérrez
DOI:10.1016/s0040-4020(01)88136-9
日期:——
Two new triterpene dimers, 7 and 8, were isolated from Maytenus umbellata and proved to be oxidized structures of tingenone from which they could also be synthesized. These compounds were screened for antimicrobial activity and compared with related compounds.
Oxidation of natural targets by dimethyl dioxirane: Regio and stereospecific reactions on enol double bond of bioactive nor quinone methide triterpenes
作者:Antonio G. González、Nelson L. Alvarenga、Ana Estévez-Braun、Angel G. Ravelo、Rafael Estévez-Reyes
DOI:10.1016/0040-4020(96)00588-1
日期:1996.8
Nor quinone methide triterpenes, like pristimerin and tingenone, possess one enol double bond (C3–C4). They also have an extended conjugation with an additional double bond (C7–C8). When these compounds are treated with dimethyl dioxirane, regio and stereoespecific oxidation occurs only on the enol double bond.
Quinone-methide triterpenes of the tingenone series were evaluated for their antimicrobial activity. These compounds were effective against Bacillus cereus, B. subtilis, Sarcinalutea, Staphylococcus aureus, Microsporum gypseum and a Gramnegative bacterium, Klebsiella pneumoniae. Under acidic conditions, the quinone-methide part of these compounds rear ranged into the divinyl-phenolic system, and the antimicrobial activity was thus lost.