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From the stem bark of Newbouldia laevis three phenylethanoid glycosides, designated as newbouldioside A–C, were isolated together with a sodium salt of analogue B and the known compounds, verbascoside, 5-hydroxydehydro-iso-α-lapachone, 3,8-dihydroxydehydro-iso-α-lapachone, apigenin and luteolin. The structures of the phenylethanoid glycosides were elucidated by spectroscopic methods as ß-(3,4-dihydroxyphenyl)ethyl...
The series of naturally occurring furanonaphthoquinones is extended by identification of the derivatives 2-(1'-methylethenyl)-5-hydroxynaphtho[2,3-b]furan-4,9-dione and 2-(1'-methylethenyl)-7-hydroxynaphtho[2,3-b]furan-4,9-dione. They are accompanied in the stem barks of Newbouldia laevis by the known analogues 5-hydroxy-dehydro-iso-α-lapachone, 2-acetyl-5-hydroxynaphtho[2,3-b]furan-4,9-dione and...
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