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Withasteroids ofPhysalis VI.1H and13C NMR spectra of withasteroids ixocarpalactone A and ixocarpanolide

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Abstract

The1H and13C NMR spectra of two withasteroids isolated fromPhysalis ixocarpa Brot. have been studied in detail. Their spectral characteristics are discussed. A comparison of the results obtained has led to the identification of a withasteroid with the composition C28H40O8, mp 291–292°C (from methanol) as ixocarpalactone A, in spite of some difference in its physical constants. The other compound, with mp 252–253°C (from methanol), had the composition C28H40O6, [α] D 20 +27±4°, is new and has been called ixocarpanolide. The structure of 5α,20R-dihydroxy-1-oxo-6α, 7α-epoxy-22R-witha-2-enolide has been proposed for it.

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Additional information

Institute of the Chemistry of Plant Substances, Academy of Sciences of the Uzbek SSR, Tashkent. Translated from Khimiya Prirodnykh Soedinenii, No. 3, pp. 326–332, May–June, 1986.

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Abdullaev, N.D., Vasina, O.E., Maslennikova, V.A. et al. Withasteroids ofPhysalis VI.1H and13C NMR spectra of withasteroids ixocarpalactone A and ixocarpanolide. Chem Nat Compd 22, 300–305 (1986). https://doi.org/10.1007/BF00598301

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Keywords

  • Methanol
  • Organic Chemistry
  • Spectral Characteristic
  • Physical Constant
  • Composition C28H40O6