Phytochemistry p. 2379 - 2381 (1991)
Update date:2022-08-11
Topics:
Zani, Carlos L.
Oliveira, Alaide B. de
Oliviera, Geovane G. de
From the trunkwood of Tabebuia ochracea, β-sitosterol, cycloolivil, lapachol, and seven furanonaphthoquinones including the known 2-(1-hydroxyethyl)naphtho<2,3-b>furan-4,9-quinone were isolated.The six new furanonaphthoquinones comprise three similar C2 alcohol-ketone pairs at C-2 as proved by oxidations with pyridinium chlorochromate. 2-Acetyl-6-methoxynaphtho<2,3-b>furan-4,9-quinone was shown to be different from the synthetic 7-methoxy isomer, while 2-acetyl-8-methoxynaphtho<2,3-b>furan-4,9-quinone and 2-acetyl-7,8-dimethoxynaphtho<2,3-b>furan-4,9-quinone were identical to the synthetic compounds.
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