A putative biosynthesis proposal for oroidin-derived marine alkaloids
serves as a template for developing a biomimetic strategy for the
syntheses of tetracyclic members of the phakellin family of sponge
metabolites. Pummerer chemistry triggers the oxidative cyclization
of the dihydrooroidin derivative, and dibromophakellin, dibromophakellstatin,
and dibromoagelaspongin all can be accessed efficiently via this
strategy.
oxidative cyclization - Pummerer - marine alkaloid