SYNTHESIS OF FUSICOCCA-2,8,10-TRIENE, A BIOGENETIC MISSING LINK, STARTING FROM STEREOSPECIFIC CONDENSATION OF TWO IRIDOID SYNTHONS

From two units of iridoid C10-synthons which could be prepared from one of the photoadducts of isoprene and methyl 2,4-dioxopentanoate, the hydrocarbon which can be designated as fusicocca-2,8,10-triene, a missing link in the biogenesis, was stereospecifally synthesized.