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.
bifunctional thiourea–tertiary amine as catalyst, domino Michael-type Friedel–Crafts alkylation/cyclization of β-naphthols with akylidene Meldrum’s acids was realized. The reactions afforded various enantioenriched β-arylsplitomicins with good yields (up to 99%) in moderate enantioselectivities (up to 79%).