Formal Synthesis of (+)-Phomactin A.

A concise formal synthesis of (+)-phomactin A has been achieved. The key features of this synthetic strategy involve a one-pot Prins/Conia-ene cyclization protocol for the construction of the highly functionalized 1-oxadeclin core (AB ring) and a late-stage direct γ-hydroxylation of enone for the installation of the C ring.