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- W2155617710 abstract "[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." @default.
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- W2155617710 date "2005-01-19" @default.
- W2155617710 modified "2023-10-18" @default.
- W2155617710 title "Nigramides A−S, Dimeric Amide Alkaloids from the Roots of <i>Piper </i><i>n</i><i>igrum</i>" @default.
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- W2155617710 doi "https://doi.org/10.1021/jo040272a" @default.
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