Total syntheses of (+)-fawcettimine and (+)-lycoposerramine-B.

The total synthesis of (+)-fawcettimine was completed in a highly stereoselective manner starting from the oxatricyclo[7.3.0.0(1,5)]dodecanedione derivative. The crucial step in this total synthesis involves the efficient construction of the azonane framework by the intramolecular Mitsunobu reaction. Furthermore, the first total synthesis of (+)-lycoposerramine-B was also accomplished via the common synthetic intermediate.