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A new diterpene, (4S,9R,10R) methyl 18-carboxy-labda-8,13(E)-diene-15-oate has been obtained from the stem barks of Polyalthia macropoda (Annonaceae). This labdanic derivative was identified on the basis of spectroscopic data and is biologically active against the promastigote Leishmania donovani donovani.
Phenylisocyanate reacts with palladium(II) bis-acetate phenanthroline complexes to give six-membered palladacycles in nearly quantitative yields. In this new reaction, the acetate ligands act as decarbonylating agents toward the isocyanate functionality by possibly forming the isolated palladacycles via an intramolecular rearrangement.
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