Chemical Synthesis of (+)-Brevianamide a Supports a Diels–Alderase-Free Biosynthesis
2019
The fungal-derived bicyclo[2.2.2]diazaoctane alkaloids are of significant interest to the
scientific community for their potent and varied biological activities. Within this large
and diverse family of natural products the insecticidal metabolite (+)-brevianamide A is
particularly noteworthy for its synthetic intractability and inexplicable biogenesis.
Despite five decades of research, this alkaloid has never succumbed to chemical
synthesis. It has been suggested that a proposed Diels–Alder reaction in the biosynthesis
of (+)-brevianamide A requires a Diels–Alderase enzyme. We herein report the first
chemical synthesis of (+)-brevianamide A (7 steps, 8.0% overall yield, 750 mg scale),
which provides compelling evidence in support of a Diels–Alderase-free biosynthesis; a
significant departure from the established biosynthesis of related alkaloids.
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