Tetrahedron Letters p. 245 - 248 (1988)
Update date:2022-08-04
Topics:
Sankaram, A. V. B.
Murthi, Marthanda M.
Bhaskaraiah, K.
Rao, Narashima G. L.
Subrahmanyam, M.
Shoolery, J. N.
Bharangin isolated from the hexane extract of the root nodules of the Ayurvedic drug.Pygmacopremna herbacea (Roxb.) Moldenke. (Verbenaceae) has been shown to be a novel diterpenoid quinonemethide incorporating a δ-lactone moiety (3) and possessing (S) configuration at the chiral carbon atom from a consideration of its mass spectrum, UV, IR, 1H NMR and 13C spectra, 2D NMR INADEQUATE and CD spectrum. (3) appears to be derived biogenetically from a hypothetical diterpenoid skeleton designated as pygmane(4).
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