Three new irregular sesquiterpenoids were isolated and characterized, along with epi-brasilenol, from the Mediterranean red alga Laurencia obtusa. They possess the unusual skeleton of brasilane and one of them contains the unprecedented 5,6-double bond (instead of a 1,6-double bond). Their structures were determined by detailed spectral analysis. The relative configurations were assigned by NOESY spectroscopy, molecular mechanics calculations (MM2) and, in one case, by a quantitative computer simulation of the lanthanide induced shifts in the H-1 NMR spectrum.
BRASILANE-TYPE SESQUITERPENOIDS FROM THE MEDITERRANEAN RED ALGA LAURENCIA-OBTUSA
AMICO, Vincenzo;
1991-01-01
Abstract
Three new irregular sesquiterpenoids were isolated and characterized, along with epi-brasilenol, from the Mediterranean red alga Laurencia obtusa. They possess the unusual skeleton of brasilane and one of them contains the unprecedented 5,6-double bond (instead of a 1,6-double bond). Their structures were determined by detailed spectral analysis. The relative configurations were assigned by NOESY spectroscopy, molecular mechanics calculations (MM2) and, in one case, by a quantitative computer simulation of the lanthanide induced shifts in the H-1 NMR spectrum.File in questo prodotto:
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