Ilicic Acid as a Natural Quiron for the Efficient Preparation of Bioactive α- and β-Eudesmol

A simple synthesis of α-Costic acid analogue with antibacterial potential, DFT and molecular docking

Natural products extracted from plants has been recognized as the most efficient starting materials to synthesize new derivatives of medicinal interest. Our research focuses on the isolation and characterization of sesquiterpene derivatives from Dittrichia Viscosa (L), as well as their hemisynthesis. To that end, a phytochemical study of Dittrichia viscosa leaves was conducted in order to obtain a sesquiterpenoid, α -Costic acid, which will be further transformed to γ -Costic acid with high yield using simple processes. Optimized molecular geometry and vibrational frequencies of both products were computed using the density functional theory. In addition, the antibacterial activity of isolated and hemisynthesized products were analyzed in vitro against Escherichia coli resistant to β-lactamase 616, Pseudomonas aeruginosa, and Staphylococcus aureus. The obtained compounds were investigated by in silico biological method to evaluate their potential inhibitory activity against same strains using FtsA, LasR proteins and DNA polymerase III enzyme.

Modification of Natural Eudesmane Scaffolds via Mizoroki-Heck Reactions

The Mizoroki-Heck reaction was applied to substrates derived from isocostic and ilicic acids, important sesquiterpene components of Dittrichia viscosa L. Greuter that were extracted directly from plant material collected in Morocco. After optimization of the metallo-catalysis conditions, various aryl-groups were successfully introduced on the exocyclic double bond with an exclusive E-configuration and without racemization.

Methyl 2-(4a,8-Dimethyl-7-oxodecahydronaphthalen-2-yl)acrylate

The title compound, C₁₆H₂₄O₃, was isolated from the aerial part of Inula Viscosa­ (L) Aiton [or Dittrichia Viscosa­ (L) Greuter]. The mol­ecule contains two fused (trans) six-membered rings which both exibit a chair conformation. In the crystal, mol­ecules are linked into chains along [100] by weak C—H⋯O hydrogen bonds involving the methyl and carbonyl groups.

Methyl 2-(1a,4a-dimethyl-2,8-dioxo-2,3,4,4a,5,6,7,8-octahydro-1aH-1-oxacyclopropa[d]naphthalen-7-yl)acrylate

The title compound, C₁₆H₂₀O₅, was synthesized from ilicic acid [2-(8-hy­droxy-4a,8-dimethyl­deca­hydro­naphthalen-2-yl)acrylic acid], which was isolated from the chloro­form extract of the aerial part of Inula viscose (L) Aiton [or Dittrichia viscosa­ (L) Greuter]. The molecule is built up from two fused six-membered rings, the epoxidized six-membered ring adopts a half-chair conformation while the other ring displays a perfect chair conformation. The crystal structure features C—H⋯O hydrogen bonds.

Methyl 2-(8a-hydroxy-4a-methyl-8-methylenedecahydronaphthalen-2-yl)acrylate

The title compound, C₁₆H₂₄O₃, was synthesized from ilicic acid which was isolated from the aerial part of Inula Viscosa­ (L) Aiton [or Dittrichia Viscosa­ (L) Greuter]. The mol­ecule contains two fused six-membered rings both in chair conformations. In the crystal, mol­ecules are linked into chains running parallel to the a axis by O—H⋯O hydrogen bonds.

Use of the Plant Bellardia trixago for the Enantiospecific Synthesis of Odorant Products

An easy procedure to obtain extracts enriched in trixagol monomalonylesther (1) from aerial parts of the plant Belladia trixago chemotype Trix was developed. Preparation of (+)-dihydro-γ-ionone (4) was carried out directly from the extracts with good yields by selective oxidation. Other interesting odorant products as α-ambrinol (5), ambraldehyde (6) and the tricyclic compound 7 were synthesized very efficiently using (4) as intermediate.

1-[(2R,4aR,8R,8aR)-8-Hy-droxy-4a,8-di-methyl-perhydronaphthalen-2-yl]ethan-1-one

The title compound, C₁₄H₂₄O₂, was synthesized from ilicic acid, which was isolated from the aerial part of Inula Viscosa­ (L) Aiton [or Dittrichia Viscosa­ (L) Greuter]. The mol­ecule contains two fused six-membered rings, which both display a chair conformation. In the crystal, mol­ecules are linked into chains propagating along the b axis by inter­molecular O—H⋯O hydrogen bonds.