trans-Resveratrol is a natural phenolic component of Vitis vinifera L. (Vitaceae). It has shown a number of biological activities, including protection against coronary heart disease, as a result of different effects: significant antioxidant activity, modulation of lipoprotein metabolism, vasodilatatory and platelet antiaggregatory properties. Recently we have reported the synthesis of a series of resveratrolo-coumarine hybrids that showed interesting vasorelaxant and platelet antiaggregatory activities [1,2]. In an attempt to prepare more active heterocyclic derivatives which incorporate the nucleus of the resveratrol, we synthesised a new series of 2-arylbenzofurane derivatives by an intramolecular Wittig reaction starting from the appropriate triphenylphosphonium salt and the corresponding aroyl chloride. The desired Wittig reagent was readily prepared from the conveniently substituted 2-hydroxy-benzyl alcohol and triphenylphosphine hydrobromide (Figure 1) [3]. However, while developing our methodology, we observed, together with the desired 2-arylbenzofurane derivatives with the general stricture 1, the formation of the side products 2 in a ratio ranging from 2:1 to 8:1. To get insight on the structure and on the mechanism of formation of these side reaction products, we decided to undertake a mass spectrometric study using an ion trap mass spectrometer operating under both EI and CI conditions. In particularly, MS/MS experiments were performed on the molecular ions and on the diagnostic fragment ions generated by the side products 2 as well as by the side product synthesised from labelled starting aroyl chloride. The data so obtained were consistent with the aroyl-benzofurane structure, a scaffold of many pharmaceutical drug candidates [4], thus allowing us to discover and develop a new and convenient approach to the preparation of this class of active compounds.

Zinc Oxide: a new tool for the solvent free regioselective C-arylsulfonation of Indoles

BEGALA, MICHELA
2011-01-01

Abstract

trans-Resveratrol is a natural phenolic component of Vitis vinifera L. (Vitaceae). It has shown a number of biological activities, including protection against coronary heart disease, as a result of different effects: significant antioxidant activity, modulation of lipoprotein metabolism, vasodilatatory and platelet antiaggregatory properties. Recently we have reported the synthesis of a series of resveratrolo-coumarine hybrids that showed interesting vasorelaxant and platelet antiaggregatory activities [1,2]. In an attempt to prepare more active heterocyclic derivatives which incorporate the nucleus of the resveratrol, we synthesised a new series of 2-arylbenzofurane derivatives by an intramolecular Wittig reaction starting from the appropriate triphenylphosphonium salt and the corresponding aroyl chloride. The desired Wittig reagent was readily prepared from the conveniently substituted 2-hydroxy-benzyl alcohol and triphenylphosphine hydrobromide (Figure 1) [3]. However, while developing our methodology, we observed, together with the desired 2-arylbenzofurane derivatives with the general stricture 1, the formation of the side products 2 in a ratio ranging from 2:1 to 8:1. To get insight on the structure and on the mechanism of formation of these side reaction products, we decided to undertake a mass spectrometric study using an ion trap mass spectrometer operating under both EI and CI conditions. In particularly, MS/MS experiments were performed on the molecular ions and on the diagnostic fragment ions generated by the side products 2 as well as by the side product synthesised from labelled starting aroyl chloride. The data so obtained were consistent with the aroyl-benzofurane structure, a scaffold of many pharmaceutical drug candidates [4], thus allowing us to discover and develop a new and convenient approach to the preparation of this class of active compounds.
2011
978-88-89884-11-9
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11584/42679
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus ND
  • ???jsp.display-item.citation.isi??? ND
social impact