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

被引:59
作者
Feldman, KS [1 ]
Quideau, S [1 ]
Appel, HM [1 ]
机构
[1] PENN STATE UNIV, PESTICIDE RES LAB, UNIVERSITY PK, PA 16802 USA
关键词
D O I
10.1021/jo961043u
中图分类号
O62 [有机化学];
学科分类号
070303 ; 081704 ;
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.
引用
收藏
页码:6656 / 6665
页数:10
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