Title:Phenanthrene Dimers: Promising Source of Biologically Active Molecules
Volume: 22
Issue: 11
Author(s): Antonino De Natale, Antonino Pollio, Anna De Marco, Giovanni Luongo, Giovanni Di Fabio and Armando Zarrelli*
Affiliation:
- Department of Chemical Sciences, University of Napoli, Federico II, via Cintia 4, I-80126, Italy
Keywords:
Dimeric phenanthrenes, Phenanthrenes, Phenanthraquinones, Biphenanthrene derivatives, Pharmacological activities, Antineuroinflammatory activity.
Abstract: To date, just over a hundred phenanthrenoid dimers have been isolated. Of these, forty-two
are completely phenanthrenic in nature. They are isolated from fourteen genera of different plants
belonging to only five families, of which Orchidaceae is the most abundant source. Other nine completely
acetylated and five methylated dimers were also defined, which were effective in establishing
the position of the free hydroxyls of the corresponding natural products, from which they were obtained
by semi-synthesis. Structurally, they could be useful chemotaxonomic markers considering that
some substituents are typical of a single-family, such as the vinyl group for Juncaceae. From a biogenetic
point of view, it is thought that these compounds derive from the radical coupling of the corresponding
phenanthrenes or by dehydrogenation of the dihydrophenanthrenoid analogs. Phenanthrenes
or dihydroderivatives possess different biological activities, e.g., antiproliferative, antimicrobial, antiinflammatory,
antioxidant, spasmolytic, anxiolytic, and antialgal effects. The aim of this review is to
summarize the occurrence of phenanthrene dimers in the different natural sources and give a comprehensive
overview of their structural characteristics and biological activities.