H
H. Yoshioka
Researcher at University of Texas at Austin
Publications - 13
Citations - 366
H. Yoshioka is an academic researcher from University of Texas at Austin. The author has contributed to research in topics: Sesquiterpene lactone & Germacranolide. The author has an hindex of 10, co-authored 13 publications receiving 357 citations.
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Journal ArticleDOI
Sesquiterpene lactones from Ambrosia confertiflora (Compositae)
TL;DR: In this paper, the isolation and chemistry of four eudesmanolides, reynosin (III), santamarine (IV), α-epoxysantamarine(V), and isotelekin (VII) from Ambrosia confertiflora collected in Mexico were described.
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The sesquiterpene lactone chemistry of the genus Parthenium (compositae)
TL;DR: The sesquiterpene lactone chemistry is summarized for seventeen taxa of Parthenium including new detailed data for four species and new preliminary results for P. fruticosum , P. hispidum and P. rollinsianum .
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Glaucolide-A and -B, new germacranolide-type sesquiterpene lactones from Vernonia (compositae)
William G. Padolina,H. Yoshioka,Nobuji Nakatani,Tom J. Mabry,Stephen A. Monti,R.E. Davis,P.J. Cox,O.A. Sim,William H. Watson,I. Beth Wu +9 more
TL;DR: The structures of two new germacranolides, glaucolide-A ( 1a ) and -B ( 1b ), isolated from more than 25 species of Vernonia from the Western Hemisphere, have been established by a series of chemical transformations, and spectral and X-ray crystallographic studies as discussed by the authors.
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The geminal coupling and paramagnetic shift of exomethylene protons in the α,β′-unsaturated γ-lactone group of sesquiterpene lactones containing C8-α-hydroxyl groups
TL;DR: In this article, it was shown that the van der Waal's proximity effect of the C8-α-hydroxyl group on sesquiterpene lactones can be used for making certain stereochemical and conformational assignments.
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The isolation and structure determination of artemisiifolin, a new germacranolide from ambrosia artemisiifolia L. (compositae)
TL;DR: The structure assigned to artemisiifolin was previously ascribed to a salonitenolide, a germacranolide from Centaurea saloitana Vis, but preliminary studies suggest that the structure of salonitanolide should be revised to formula II.