Abstract
An efficient synthesis of the C22-C40 domain of the azaspiracids is described. The synthetic route features a Nozaki-Hiyama-Kishi (NHK) coupling and chelation controlled Mukaiyama aldol reaction to access an acyclic intermediate and a double-intramolecular-hetero-Michael addition (DIHMA) to provide the FG-ring system bridged ketal.
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