The total synthesis of the potent immunosuppressant FR901483 is described,
In a key step, the intermolecular Diels-Alder cycloaddition of an amidoacro
lein with 2-(triisopropylsilyloxy)-1,3-butadiene produced the desired 3-cyc
lohexene-1-carboxaldehyde. This compound was subjected to basic followed by
acidic conditions which effected two sequential aldol cyclizations to deli
ver the tricyclic ring system of the natural product, suitably functionaliz
ed for completion of the total synthesis.