A Unified Bioinspired “Aplysinopsin Cascade”: Total Synthesis of (.+‐.)‐Tubastrindole B and Related Biosynthetic Congeners.

(.+-.)-Tubastrindole B (Ia) and a precursor of (.+-.)-tubastrindole E (Ib) are prepared by a ring-expansion cascade of a dictazole-type precursor.