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The debromokeramadine (2a), which was isolated from the Pacific sponge Agelas cf. mauritiana, is described in this manuscript. We also report the synthesis of the debromokeramadine (2a) and its known brominated analog, keramadine (1), based on the regioselective oxidative addition of a guanidine derivative on N-acylpyrrole dihydropyridines. This flexible approach was applied to the preparation of...
Through a general synthetic scheme, hymenidin, oroidin and keramadine, all marine 2-aminoimidazole metabolites were prepared. Seven steps from imidazolemethanol provided an improved synthesis of oroidin and the first synthesis of hymenidin and keramadine.
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