A comparative study on the crystal structure of bicycle analogues to the natural phytotoxin helminthosporins
Nenhuma Miniatura disponível
Data
2016
Título da Revista
ISSN da Revista
Título de Volume
Editor
Resumo
Herein we described structural insights of a series of analogues to helminthosporin phytotoxins. The key reaction used to prepare the compounds corresponded to the [3 + 4] cycloaddition between the oxyallyl cation generated from 2,4-dibromopentan-3-one and different furans. Their structures were confirmed upon IR, NMR and X-ray diffraction analyses. While bicycles 7, 8 and 9 crystallize in the centrosymmetric monoclinic space group P21/c, compound 10 was solved in the noncentrosymmetric orthorhombic space group P212121. The solid materials obtained were shown to be racemic crystals (7, 8, 9) or racemic conglomerate (10). In all compounds, there is formation of a bicycle featured by fused tetrahydropyranone and 2,5-dihydrofuran rings. They adopt chair and envelope conformations, respectively. Crystal packing of all compounds is stabilized through C–H•••O contacts. Conformational aspects as well as similarities and differences among the crystal structures of the synthesized analogues are discussed.
Descrição
Palavras-chave
Citação
BARBOSA, Luiz Cláudio de Almeida et al. A comparative study on the crystal structure of bicycle analogues to the natural phytotoxin helminthosporins. Journal of Molecular Structure, Amsterdam, v. 1105, p. 256-262, 2016. DOI: 10.1016/j.molstruc.2015.10.058. Disponível em: https://www.sciencedirect.com/science/article/abs/pii/S0022286015303604?via%3Dihub. Acesso em: 28 nov. 2023.