Molecules (Mar 2014)

Sesquiterpenes from the Brazilian Red Alga Laurencia dendroidea J. Agardh

  • Fernanda Lacerda da Silva Machado,
  • Thatiana Lopes Biá Ventura,
  • Lísia Mônica de Souza Gestinari,
  • Valéria Cassano,
  • Jackson Antônio Lamounier Camargos Resende,
  • Carlos Roland Kaiser,
  • Elena B. Lasunskaia,
  • Michelle Frazão Muzitano,
  • Angélica Ribeiro Soares

DOI
https://doi.org/10.3390/molecules19033181
Journal volume & issue
Vol. 19, no. 3
pp. 3181 – 3192

Abstract

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Two new chamigrane sesquiterpenes 1–2 and three known compounds 3–5 were isolated from a lipophilic extract of the red alga Laurencia dendroidea collected from the Southeastern Brazilian coast. Dendroidone (1) and dendroidiol (2) were isolated from samples collected at Biscaia Inlet, Angra dos Reis, Rio de Janeiro and at Manguinhos Beach, Serra, Espírito Santo, respectively. Debromoelatol (3), obtusane (4) and (1S*,2S*,3S*,5S*,8S*,9S*)-2,3,5,9-tetramethyltricyclo[6.3.0.01.5]undecan-2-ol (5) were obtained from specimens collected at Vermelha Beach, Parati, Rio de Janeiro. The structures of new compounds were elucidated by extensive NMR (1H-, 13C-, COSY, HSQC, HMBC and NOESY) and high resolution mass spectrometry analysis. Additionally, the absolute configuration of compound 2 was assigned by X-ray analysis. Full spectroscopic data is described for the first time for compound 3. Anti-inflammatory and antimycobacterial activities of compounds 2–5 were evaluated. Compounds 3–5 inhibited the release of inflammatory mediator NO while TNF-α levels were only affected by 3. All compounds tested displayed moderate antimycobacterial action.

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