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Vitexlactam A, a novel labdane diterpene lactam from the fruits of Vitex agnus-castus

✍ Scribed by Sheng-Hong Li; Hong-Jie Zhang; Sheng-Xiang Qiu; Xue-Mei Niu; Bernard D. Santarsiero; Andrew D. Mesecar; Harry H.S. Fong; Norman R. Farnsworth; Han-Dong Sun

Publisher
Elsevier Science
Year
2002
Tongue
French
Weight
146 KB
Volume
43
Category
Article
ISSN
0040-4039

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✦ Synopsis

A novel labdane diterpene alkaloid, vitexlactam A (1) was isolated as a prism from the n-hexane extract of the fruits of Vitex agnus-castus through normal and reverse phase column chromatography. Its structure was elucidated to be 6b-acetoxy-9a-hydroxy-13( 14)-labden-16,15-amide, based on chemical and spectral evidences including 1D and 2D NMR spectra. The structure was confirmed by X-ray crystallographic analysis. Compound 1 is the first naturally occurring labdane diterpenoid containing an a,b-unsaturated g-lactam moiety.

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