Synthesis and biological evaluation of new cross-conjugated dienone marine prostanoid analoguesElectronic supplementary information (ESI) available: 1H NMR, COSY and NOESY spectra. See http://www.rsc.org/suppdata/ob/b4/b404016c/
synthesis of a series of brominated cross-conjugated dienones, marine prostanoid analogues, was considered using two cyclopentannelation processes, from enamine (by a domino 3-aza Claisen/Mannich reaction) and from dioxolane ester alkylation followed by intramolecular Wittig reaction. All the compounds synthesized featured the same cross-conjugated dienone system, with a vicinal syn or anti diol on the omega-chain