To confirm the structure of carabrone (I), a cyclopropanoid sesquiterpene lactone isolated from Carpesium abrotanoides Linn., (±)-perhydro-5aα-methyl-3-methylene-5α-(3-oxobutyl)cyclopropa[f]benzofuran-2-one (I) has been synthesised. The i.r. spectrum and gas chromatographic retention time of this racemic compound were identical with those of carabrone.
H. Minato and I. Horibe, J. Chem. Soc. C, 1968, 2131 DOI: 10.1039/J39680002131
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