Isolation, chemical characterization and phytotoxicity of nine polyhydroxylated terpenes (five C13 nor-isoprenoids, two sesquiterpenes, a spirostane and a pseudosapogenin) from Cestrum parqui LHerr are reported. In this work we completed the phytochemical investigation of the terpenic fraction of the plant and described the structural elucidation of polar isoprenoids using NMR methods. All the configurations of the compounds have been assigned by NOESY experiments. Four new structures have been identified as (3S,5R,6R,7E,9R)-5,6,9-trihydroxy-3-isopropyloxy-7-megastigmene, 5a-spirostan-3b,12b,15a-triol, and 26-O-(30-isopentanoyl)-b-Dglucopyranosyl- 5a-furost-20(22)-ene-3b,26-diol, and as an unusual tricyclic sesquiterpene. The compounds have been assayed for their phytotoxicity on lettuce at the concentrations ranging between 104 and 107 M. The activities of some compounds were similar to that of the herbicide pendimethalin.

Structural characterization of phytotoxic terpenoids from Cestrum parqui / Fiorentino, Antonio; Monaco, Pietro; A., Natale; P., Oriano; Zarrelli, Armando; DELLA GRECA, Marina. - In: PHYTOCHEMISTRY. - ISSN 0031-9422. - STAMPA. - 66(22):(2005), pp. 2681-2688.

Structural characterization of phytotoxic terpenoids from Cestrum parqui.

FIORENTINO, ANTONIO;MONACO, PIETRO;ZARRELLI, ARMANDO;DELLA GRECA, MARINA
2005

Abstract

Isolation, chemical characterization and phytotoxicity of nine polyhydroxylated terpenes (five C13 nor-isoprenoids, two sesquiterpenes, a spirostane and a pseudosapogenin) from Cestrum parqui LHerr are reported. In this work we completed the phytochemical investigation of the terpenic fraction of the plant and described the structural elucidation of polar isoprenoids using NMR methods. All the configurations of the compounds have been assigned by NOESY experiments. Four new structures have been identified as (3S,5R,6R,7E,9R)-5,6,9-trihydroxy-3-isopropyloxy-7-megastigmene, 5a-spirostan-3b,12b,15a-triol, and 26-O-(30-isopentanoyl)-b-Dglucopyranosyl- 5a-furost-20(22)-ene-3b,26-diol, and as an unusual tricyclic sesquiterpene. The compounds have been assayed for their phytotoxicity on lettuce at the concentrations ranging between 104 and 107 M. The activities of some compounds were similar to that of the herbicide pendimethalin.
2005
Structural characterization of phytotoxic terpenoids from Cestrum parqui / Fiorentino, Antonio; Monaco, Pietro; A., Natale; P., Oriano; Zarrelli, Armando; DELLA GRECA, Marina. - In: PHYTOCHEMISTRY. - ISSN 0031-9422. - STAMPA. - 66(22):(2005), pp. 2681-2688.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/202134
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