Novel lactone chamigrene-derived metabolites from <I>Laurencia majuscula</I>
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Gomerolactones A–D along with the known majusculone, obtusol, and elatol were isolated from Laurencia majuscula, and their structures were determined spectroscopically. With the aid of Pirkle’s reagent at low temperature, NMR spectroscopy was used to determine the absolute configuration at the ring closure carbon atom of a a-alkylidene-?-lactone and an a-alkylidene-d-lactone unit embedded in the chamigrene network of compounds 1 and 2, respectively. The absolute stereochemistry of compounds 3 and 4 was determined by Xray analysis.
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Diaz Marrero, Ara R., Brito, Inmaculada, de la Rosa, Jose M., D'Croz, Luis, Fabeo, Oscar, Ruiz-Perez, Catalina, Darias, Jose, and Cueto, Mercedes. 2009. "<a href="https://repository.si.edu/handle/10088/11856">Novel lactone chamigrene-derived metabolites from <I>Laurencia majuscula</I></a>." <em>European Journal of Organic Chemistry</em>, 2009, (9) 1407–1411. <a href="https://doi.org/10.1002/ejoc.200801006">https://doi.org/10.1002/ejoc.200801006</a>.