Nigramides A-S, dimeric amide alkaloids from the roots of Piper nigrum.
[structure: see text] Fifteen novel dimeric amide alkaloids possessing a cyclohexene ring, nigramides A-O (1-15), as well as four novel dimeric amide alkaloids possessing a cyclobutane ring, nigramides P-S (17-20), have been isolated from the roots of Piper nigrum. Their structures were elucidated on the basis of their spectroscopic data. The biosynthestic hypothesis of nigramides A-O (1-15) was proposed by an intermolecular Diels-Alder reaction from the corresponding monomeric amides. On the basis of this biosynthetic hypothesis, the first study of the thermal and Lewis acid mediated Diels-Alder reactions of piperine in different organic solvents and under solventless conditions is also described.[1]References
- Nigramides A-S, dimeric amide alkaloids from the roots of Piper nigrum. Wei, K., Li, W., Koike, K., Chen, Y., Nikaido, T. J. Org. Chem. (2005) [Pubmed]
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