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The first total synthesis of the natural enantiomer of the insect-antifeedant dihydroclerodin (1)
and lupulin C (40) has been achieved starting from (R)-(−)-carvone (2). In the applied strategy,
the hexahydrofuro[2,3-b]furan moiety was introduced in an early stage of the synthesis. The correct
configuration at C-9, C-11, C-13, and C-16 was established by application of a remarkably
diastereoselective Mukaiyama reaction. The desired configuration at C-10 was obtained by catalytic
reduction of the intermediate enone 21. After annulation of the second ring, the structural features
at C-4, C-5, and C-6 were introduced. The successful finishing of the synthesis included a Chugaev
elimination to give the exocyclic double bond at C-4 that is present in lupulin C. Oxidation of this
double bond with m-CPBA afforded dihydroclerodin.
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