Journal of the Brazilian Chemical Society
versão impressa ISSN 0103-5053
WANG, Hong-Juan; REN, Xiao-Qian; ZHANG, Yan-Yan e ZHANG, Zhan-Hui. Synthesis 12-Aryl or 12-Alkyl-8,9,10,12-tetrahydrobenzo[a]xanthen-11-one derivatives catalyzed by dodecatungstophosphoric acid. J. Braz. Chem. Soc. [online]. 2009, vol.20, n.10, pp.1939-1943. ISSN 0103-5053. http://dx.doi.org/10.1590/S0103-50532009001000025.
An efficient protocol for the synthesis of 12-aryl or 12-alkyl-8,9,10,12-tetrahydro-benzo[a]xanthen-11-one derivatives has been developed via three-component reaction of aldehyde, 2-naphthol and 1,3-cyclohexadione or 5,5-dimethyl-1,3-cyclohexadione in the presence of 12-tungstophosphoric acid (H3PW12O40) under solvent-free conditions. The present methodology offers several advantages such as high yields, simple procedure, low cost, short reaction times, and mild conditions.
Palavras-chave : xanthene; multi-component reaction; 2-naphthol; aldehydes; 12- tungstophosphoric acid; heteropoly acid; solvent-free conditions.