Furanonaphthoquines from Tabebuia ochracea
1991
Zani, C.L. | Oliveira, A.B. de | Oliviera, G.G. de
From the trunkwood of Tabebuia ochracea, beta-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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