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ABSTRACTThe structure of several guaianolides have been recently determined in our laboratory. The configuration of the asymmetric centres at C-5, C-6 and C-7 of estafiatin (I), zaluzanins G and D (Ha and lib), ligustrin (III), cumambrins A and B (IVa and IVb) and bahias I and II (VIIIa and VIIIb) have been established by correlation between them and with a derivative of isophoto-α-santonic lactone. Two sesquiterpene lactones found as constituents of Artemisia klotzchiana were identified as matricarin (XIIb) and desacetylmatricarin (XIIa). A new guaianolide named chrysartemin was isolated from the same source. The structure XIII was proposed for this lactone 2. The known eudesmanolides arglanin (XVIII) and douglanin (XIX) were isolated from A. mexicana 3. A recent study of several species in the genus Helenium, Ambrosia, Franseria and Hymenoxis led to the isolation of several sesquiterpene lactones. The structure of franserin (XXX), confer tin (XXXI), odoratin (XXXII) and canambrin was established 4. A transformation of a furoeremophylane into a furonaphtalene derivative is described.

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