Synthesis and transformation of halochromones

• Autor(a) principal: Tomé, Sara M.
• Data de Publicação: 2014
• Outros Autores: Silva, Artur, Santos, Clementina M.M.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://hdl.handle.net/10198/11714
• topic: Chromones; Cross-coupling reactions; Halochromones; Halogenation; Reactivity; Synthesis

Chromones (4H-1-benzopyran-4-ones) are one of the most abundant groups of naturally occurring oxygen containing heterocyclic compounds possessing a benzo-γ-pyrone framework, 1a. The significance of these widely spread and highly diverse compounds is far beyond the important biological functions they assume in nature [1, 2]. Natural and synthetic chromone derivatives have been assigned as lead structures in drug development with some already being marketed [3]. The majority of the naturally occurring chromones are 2- and 3-aryl derivatives, called flavones 1b and isoflavones 1c, respectively. However, other types of chromones have also been found in the plant kingdom, such as 3-methylchromones 1d and 2- styrylchromones 1e (Fig. 1).