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      Naphthoquinone esters from the root of Rhinacanthus nasutus.

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          Abstract

          Reinvestigation of the root of Rhinacanthus nasutus afforded, in addition to rhinacanthin-A to -D reported previously, two new dimethyldihydropyranonaphthoquinone esters (5, 6) and eight new 2-hydroxy-1,4-naphthoquinone esters (7-14) were isolated. The stereochemistry of rhinacanthin-A was determined as the R configuration. Compounds rhinacanthin-G to -N, belong to a class of 2-hydroxy-3-(3-hydroxy-2,2-dimethylpropyl)-1,4-naphthoquinone esters, and so far have been isolated only in this plant. Their biosynthesis is also discussed.

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          Author and article information

          Journal
          Chem. Pharm. Bull.
          Chemical & pharmaceutical bulletin
          0009-2363
          0009-2363
          Mar 1998
          : 46
          : 3
          Affiliations
          [1 ] Department of Chemistry, National Cheng Kung University, Tainan, Taiwan, R.O.C.
          Article
          9549882

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