A Simple and Green Approach for the Synthesis of Tetrahydrobenzo[a]-xanthen-11-one Derivatives Using Tetrabutyl Ammonium Fluoride in Water
作者:Ching-Fa Yao、Shijay Gao、Chen Tsai
DOI:10.1055/s-0028-1088214
日期:2009.4
An efficient and simple procedure for the synthesis of 12-aryl- or 12-alkyl-8,9,10,12-tetrahydrobenzo[a]xanthen-11-one derivatives has been described. This one-pot multicomponent reaction involves the reaction of aldehydes, 2-naphthol, and cyclic 1,3-diketones in the presence of catalytic amount of recyclable TBAF in water.
Résumé Cerium(III) chloride is found to be an highly efficient catalyst for the addition of aldehydes, β-naphthol and cyclic 1,3-dicarbonyl compounds/Meldrum's acid via a multicomponent reaction. The easy availability of starting materials, novel and eco-friendly procedure makes this strategy more useful for the preparation of tetrahydrobenzo[a]-xanthen-11-one, and benzo[f]chromen-3-one derivatives.
An efficient and simple method for the synthesis of 1-aryl-1,2-dihydro-benzo[f]chromen-3-ones via a one-pot three-component reaction of β-naphthol, arylaldehydes and Meldrum's acid with Et3N as a base in CH3CN under reflux is reported. All the products were obtained in good to excellent yields and their structures were established from their spectroscopic data.