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.