A New Helenanolide, 11βH-Dihydro-4-epineopulchellin, Isolated from Gaillardia grandiflora

Kenzo HARIMAYA; Noriko ARAI; Seiichi INAYAMA

doi:10.1248/cpb.37.2525

Kenzo HARIMAYA, Noriko ARAI, Seiichi INAYAMA

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Keywords: Gaillardia grandiflora, 11βH-dihydro-4-epineopulchellin, 11αH-dihydro-4-epineopulchellin, pseudoguaianolide, ^1H-¹H COSY, Compositae

JOURNAL FREE ACCESS

1989 Volume 37 Issue 9 Pages 2525-2527

DOI https://doi.org/10.1248/cpb.37.2525

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Abstract

A new pseudoguaianolide named 11βH-dihydro-4-epineopulcehllin (1a) was isolated from the methanol extract of Gaillardia grandiflora. The stereostructure was determined on the basis of spectral evidence, especially proton nuclear magnetic resonance (including the ¹H-¹H correlation spectroscopy technique), and was confirmed by the transformation from neopulchellin (2a).

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