Galloyl-Derived Orthoquinones as Reactive Partners in Nucleophilic Additions and Diels−Alder Dimerizations: A Novel Route to the Dehydrodigalloyl Linker Unit of Agrimoniin-Type Ellagitannins
摘要:
Orthochloranil-mediated oxidation of galloyl monoethers furnishes the derived orthoquinones in excellent yield. These reactive electrophiles participate in a variety of nucleophilic addition reactions with heteroatomic and carbanionic partners. In addition, Lewis acid-mediated dimerization of the orthoquinones provides an efficient route to dehydrodigalloyl-type diaryl ether units characteristic of several ellagitannin natural products. The implications for ellagitannin biosynthesis and gallotannin-protein covalent attachment are discussed.
Chemistry of Gallotannin-Derived o-Quinones: Reactivity toward Nucleophiles
作者:Stephane Quideau、Ken S. Feldman、Heidi M. Appel
DOI:10.1021/jo00121a012
日期:1995.8
Incorporation of catechyl monomers into lignins: lignification from the non-phenolic end <i>via</i> Diels–Alder cycloaddition?
作者:Daisuke Ando、Fachuang Lu、Hoon Kim、Alexis Eugene、Yuki Tobimatsu、Ruben Vanholme、Thomas J. Elder、Wout Boerjan、John Ralph
DOI:10.1039/d1gc03022a
日期:——
diene in a hetero-Diels–Alder reaction, a benzodioxane structure was produced with a different regiochemistry than the benzodioxane isomer produced viaradical coupling; (ii) when the quinone's diene participated in the Diels–Alderreaction, a distinctive oxatricyclo structure was produced. Both features may be used as markers for the occurrence of Diels–Alderreactions in lignification. Examination
Galloyl-Derived Orthoquinones as Reactive Partners in Nucleophilic Additions and Diels−Alder Dimerizations: A Novel Route to the Dehydrodigalloyl Linker Unit of Agrimoniin-Type Ellagitannins
作者:Ken S. Feldman、Stéphane Quideau、Heidi M. Appel
DOI:10.1021/jo961043u
日期:1996.1.1
Orthochloranil-mediated oxidation of galloyl monoethers furnishes the derived orthoquinones in excellent yield. These reactive electrophiles participate in a variety of nucleophilic addition reactions with heteroatomic and carbanionic partners. In addition, Lewis acid-mediated dimerization of the orthoquinones provides an efficient route to dehydrodigalloyl-type diaryl ether units characteristic of several ellagitannin natural products. The implications for ellagitannin biosynthesis and gallotannin-protein covalent attachment are discussed.