stereoselective synthesisTartaric acid is the starting point for the stereoselective synthesis of the butenolide unit (see scheme)in peridinin, a marine carotenoid. Key steps were the desymmetrization of tartaric acid bis(Weinreb amide), an E‐selective olefination by Ando‐type bromophosphonates, ...
The structures of the new compounds were elucidated on the basis of spectrometric analyses. They possess an unprecedented skeleton comprising the adduct of a butenolide moiety and apigenin glycoside linked via a 1,2-dioxane moiety. 展开 关键词: alpha-glucosidase chemical structure enzyme inhibitors ...
The butenolide moiety is present in numerous biologically active natural products, especially insect sex hormones. A method was developed for the synthesis of butenolides from β,γ-unsaturated esters. Separation of diastereomers and enantiomers of these esters and butenolides including mint and isomint...
Recently, a bicyclic compound containing a condensed butenolide moiety, 3-methyl-2H-furo[2,3-c]pyran-2-one (1), was reported as a pote... ME Light,BV Burger,S Dan,... - 《Journal of Natural Products》 被引量: 192发表: 2010年 Seed germination of agricultural weeds is promoted by ...
The epimers (1 and 2) are two unusual diterpenoid lactones bearing a β-methyl-γ-substituted butenolide moiety, and 3 and 8 represent the first ... Peng,Yang,Ding-Quan,... - 《Bioorganic & Medicinal Chemistry》 被引量: 5发表: 2015年 Convergent Total Synthesis of Bioactive Cardenolides ...
Although no correlation to a quaternary aromatic carbon C-12a (dC 136.5) was detected, this carbon was assigned to the remaining naphthoquinone moiety. These assignments are also supported by comparing 13C NMR chemical shifts with those of brasiliquinone B.8 The molecular formula of 1 suggests ...
Metal-catalysed asymmetric allylic alkylation reactions have played a pivotal role in the construction of chiral compounds. When applied to the synthesis of butenolides, a common moiety present in many biologically active compounds, this reaction has alw
Depending on the chemical nature of the β-dicarbonyl moiety (oxoester, diketone or α-acetyl lactone or lactam), products with either annulated or spirocyclic constitution are obtained.SchickmousInstitut für ChemieCarl von Ossietzky Universität OldenburgBarhiem...
The key process was the formation of the cycloheptanone moiety by the addition of the double bond in the caffeic acid unit to an α,β-unsaturated ketone. This information may be of considerable interest for the development of a new and efficient synthetic approach to benzocycloheptanone ...
For the corresponding 3-(fluoroiodoacetoxy) derivative this observation precludes the application of the intramolecular Wittig–Horner synthesis to modify quinoline-2,4(1,3)-diones by the annulation of a fluorinated but-2-enolide moiety.Graphical abstract...