The structures of amijitrienol and 14-deoxyisoamijiol, two new diterpenoids isolated from the brown seaweed Dictyota linearis, have been established as 1 and 2 on the basis of spectral and chemical evidence.
The Diels-Alder adducts of furan with methyl acrylate were successfully prepared by two methods on a preparative scale. The BF3·OEt2-catalyzed reaction of furan with methyl acrylate gave a 7:3 mixture of endo and exo adducts in 75.7% yield. When acryloyl chloride was used as a dienophile, after esterification with methanol, a 3:7 mixture of the same adducts was obtained in 76.5% overall yield.
A new diterpenoid, litophynin C, which exhibits insect growth inhibitory activity against the silkworm, Bombyx mori L., has been isolated from a soft coral Litophyton sp., and its structure including the absolute configuration established on the basis of spectral and chemical evidence.
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