Abstract
Bromo-substituted quinoid compounds are widespread in nature (examples are alkaloids discorhabdins, verongiaquinol, components of plant pigments, etc.), and they exhibit pronounced antibacterial activity [1]. Synthetic analogs of natural compounds could also be expected to display various kinds of biological activity. Furthermore, regioselective introduction of bromine atoms into quinoid ring should make further nucleophilic functionalization of the bromination products more unambiguous with a view to obtain compounds having pharmacophoric groups. On the other hand, heterocyclic compounds whose molecules contain quinoid fragments are convenient substrates for various transformations due to their fairly rare ability to undergo functionalization under mild conditions by the action of both nucleophilic and electrophilic reagents, as well as of radical species.
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