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The complex ABC‐tricyclic structure of crotophorbolone, a derivative of the tigliane diterpenoids, was assembled by coupling of simple fragments. The six‐membered C‐ring fragment, having five contiguous stereocenters, was stereoselectively constructed from (R)‐carvone. After attachment of the five‐membered A‐ring through the π‐allyl Stille coupling reaction, the α‐alkoxy bridgehead radical reaction...
19 zu 19: Eine konvergente Totalsynthese von 19‐Hydroxysarmentogenin geht von drei einfachen Fragmenten aus. Das gewünschte Produkt wurde in 19 Stufen ausgehend vom AB‐Ring unter Aufbau von sechs stereogenen Zentren und der Bildung dreier C‐C‐Bindungen synthetisiert.
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