Synthesis of 2-hydroxy-3-methylbut-3-enyl substituted coumarins and xanthones as natural products. Application of the Schenck ene reaction of singlet oxygen with ortho-prenylphenol precursors
摘要:
Application of our original photooxidation-reduction methodology to prenylated dihydroxycoumarin and trihydroxyxanthone compounds led to the corresponding ortho-(2-hydroxy-3-methylbut-3-enyl)phenol derivatives with yields ranging from 8 to 65%. In most of the reported experiments, the oxidation products distribution, after the photooxygenation step, was controlled by the competition between the large group effect and the stabilising phenolic assistance effect. We also showed that ortho-(3-hydroxy-3-methylbut-1-enyl)phenol derivatives could be considered as biogenetic precursors of 2,2-dimethylbenzopyranic structures. (C) 2004 Elsevier Ltd. All rights reserved.
Methods and compositions for lowering levels of blood lipids
申请人:Pharmacia Corporation
公开号:US20040014806A1
公开(公告)日:2004-01-22
Disclosed are methods to lower blood cholesterol levels or inhibit ileal apical sodium co-dependent bile acid transport (ASBT) protein using coumarin and anthracene dione derivatives. Pharmaceutical compositions are also disclosed.
PLANT EXTRACT OBTAINED FROM KIELMEYERA AUREOVINOSA WHICH HAS ANTIBIOTIC ACTIVITY, ISOLATED CHEMICAL COMPOUND, COMPOSITIONS COMPRISING SAME, USES THEREOF AND METHODS FOR PREVENTING AND TREATING BACTERIAL INFECTIONS
申请人:Extracta Moléculas Naturais S/A
公开号:EP2735311A1
公开(公告)日:2014-05-28
The present invention refers primarily to a plant extract obtained from Kielmeyera aureovinosa which has accentuated antibiotic activity. In a second modality, the invention describes a new chemical compound isolated from the same, as well as variations thereof. In other terms, the present invention provides compositions comprising a phytotherapic obtained from said plant extract, as well as veterinary pharmaceutical compositions comprising isolated compounds and variations of the same.
Additionally, the present invention provides uses of the plant extract, chemical compounds and compositions comprising the same for the preparation of medicines for the prevention or treatment of bacterial infections, as well as methods of prevention or treatment of the same.
Crombie, Leslie; Jones, Raymond C. F.; Palmer, Christopher J., Journal of the Chemical Society. Perkin transactions I, 1987, p. 317 - 332
作者:Crombie, Leslie、Jones, Raymond C. F.、Palmer, Christopher J.
DOI:——
日期:——
Synthesis of 2-hydroxy-3-methylbut-3-enyl substituted coumarins and xanthones as natural products. Application of the Schenck ene reaction of singlet oxygen with ortho-prenylphenol precursors
Application of our original photooxidation-reduction methodology to prenylated dihydroxycoumarin and trihydroxyxanthone compounds led to the corresponding ortho-(2-hydroxy-3-methylbut-3-enyl)phenol derivatives with yields ranging from 8 to 65%. In most of the reported experiments, the oxidation products distribution, after the photooxygenation step, was controlled by the competition between the large group effect and the stabilising phenolic assistance effect. We also showed that ortho-(3-hydroxy-3-methylbut-1-enyl)phenol derivatives could be considered as biogenetic precursors of 2,2-dimethylbenzopyranic structures. (C) 2004 Elsevier Ltd. All rights reserved.
Synthesis of mammeins and surangin a
作者:Leslie Crombie、Raymond C.F. Jones、Christopher J. Palmer
DOI:10.1016/s0040-4039(00)98874-9
日期:1985.1
Syntheses of natural 4-alkyl and 4-aryl coumarins with hexasubstituted aromatic rings, uncouplers of oxidative phosphorylation, are reported. MammeaB/BB, by synthesis, is the (S)-(−)-compound.
据报道,天然的4-烷基和4-芳基香豆素与六取代的芳环(氧化磷酸化的解偶联剂)的合成。合成的Mammea B / BB是(S)-(-)-化合物。