Extending Pummerer Reaction Chemistry. Application to the Total Synthesis of (±)-Dibromoagelaspongin
作者:Ken S. Feldman、Matthew D. Fodor
DOI:10.1021/ja807020d
日期:2008.11.12
The sponge metabolite dibromoagelaspongin was synthesized in 16 steps from imidazole. The route features two successive oxidative cyclizations with complete control of regiochemistry to deliver the unusual triaminomethane core of the target. These oxidative cyclizations likely resulted from Pummerer-like processes on the imidazole-2-sulfoxide (sulfide) precursors.
Extending Pummerer Reaction Chemistry: (±)-Dibromoagelaspongin Synthesis and Related Studies
作者:Ken S. Feldman、Matthew D. Fodor
DOI:10.1021/jo900283g
日期:2009.5.1
The sponge-derived alkaloid dibromoagelaspongin was prepared from a dihydrooroidin derivative by exploiting the Pummerer reaction twice in succession. Oxidative cyclization of the substrate’s pyrrole-2-carboxamide function into the imidazole moiety was achieved in a regiospecific manner to establish both C−N bonds to C(6) of the target.
Synthesis of Dibromophakellin, Dibromophakellstatin, and Dibromoagelaspongin via Oxidative Cyclization of Dihydrooroidin Derivatives
作者:Ken Feldman、Matthew Fodor、Amanda Skoumbourdis
DOI:10.1055/s-0029-1216939
日期:2009.9
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