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Concise routes for the total and formal syntheses of the amathaspiramides were developed through a formal [3+2] cycloaddition between lithium(trimethylsilyl)diazomethane and α,β‐unsaturated esters. The effectiveness of this new cycloaddition for the construction of Δ2‐pyrazolines containing a α‐tert‐alkylamino carbon center and subsequent facile protonolytic NN bond cleavage allows the synthesis...
Jeder Reaktion ihr Metall – durch mehrere metallkatalysierte C‐O‐ und C‐C‐Kupplungsreaktionen zu (−)‐Dactylolid (siehe Schema): Die Bildung eines trisubstituierten Z‐Vinylboronats durch eine Alder‐En‐Reaktion mit anschließender rheniumvermittelter regioselektiver Umlagerung eines Allylalkohols ist das Markenzeichen dieser konvergenten Synthese.
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