Benzophenone O -glucoside, a biogenic precursor of 1,3,7-trioxygenated xanthones in Hypericum annulatum
摘要:
Two new benzophenones, hypericophenonoside (1) and annulatophenone (2) were isolated from the methanol extract of the herb of Hypericum annulatum. The structures of the benzophenones were established as 2'-O-beta -D-glucopyranosyl-2,4,5',6-tetrahydroxy benzophenone (1) and 2,3',5',6-tetrahydroxy-4-methoxybenzophenone (2) based on spectral and chemical evidence. Hypericophenonoside is the second benzophenone O-glycoside found in nature. Acid and enzymatic hydrolysis of (1) has led directly to the formation of 1,3,7-trihydroxyxanthone (gentisein). This fact confirmed the hypothesis that some xanthones could be formed in plants by dehydration of 2,2'-dihydroxybenzophenones, and the intermediate precursors appear to be benzophenone O-glycosides ortho to the carbonyl function. (C) 2001 Elsevier Science Ltd. All rights reserved.
Quantitative Struktur-Wirkungs-Beziehung bei Polyhydroxyxanthonen, 2. Mitt.1): Synthese mehrfach oxigenierter 2-Hydroxyxanthone
摘要:
Es wird die Synthese der 2-Hydroxyxanthone 8 über die entsprechenden Polymethoxyxanthone 7 beschrieben, die in Ring C mehrfachhydroxyliert sind。Die Darstellung verläuft entweder über die 2-Phenoxybenzosäuren 5 or die polymethoxylierten 2-Hydroxybenzophenone 6。
Arylalkyl Ketones, Benzophenones, Desoxybenzoins and Chalcones Inhibit TNF-α Induced Expression of ICAM-1: Structure-Activity Analysis
作者:Sarvesh Kumar、Chandra Shekhar Reddy L、Yogesh Kumar、Amit Kumar、Brajendra K. Singh、Vineet Kumar、Shashwat Malhotra、Mukesh K. Pandey、Rajni Jain、Rajesh Thimmulappa、Sunil K. Sharma、Ashok K. Prasad、Shyam Biswal、Erik Van der Eycken、Anthony L. DePass、Sanjay V. Malhotra、Balaram Ghosh、Virinder S. Parmar
DOI:10.1002/ardp.201100279
日期:2012.5
potent intercellular cell adhesion molecule‐1 (ICAM‐1) inhibitors, a large number of arylalkylketones, benzophenones, desoxybenzoins and chalcones and their analogs (54 in total) have been synthesized and screened for their ICAM‐1 inhibitory activity. The structure‐activity relationship studies of these compounds identified three potent chalcone derivatives and also demonstrated the possible mechanism