Constituents of the Egyptian Centaurea scoparia; Part II. Guaianolides of the Aerial Parts.
Aerial parts of CENTAUREA SCOPARIA Sieb. afforded a new chlorinated guaianolide with an unusual isobutyl structural feature, diain ( 1), together with three known guaianolides, janerin ( 2), cynaropicrin ( 3), and deacylcynaropicrin ( 4). Structural assignments of the isolated compounds are based on spectroscopic methods including 1D- and 2D-NMR spectroscopy as well as mass spectroscopy. New and revised (1)H- and (13)C-NMR data are reported.
Youssef
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Pharmazeutisches Institut der Universität, Hermann-Herder-Str. 9, D-79104 Freiburg, Federal Republic of Germany.
Frahm
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