Strontium triflate catalyzed one-pot condensation of β-naphthol, aldehydes and cyclic 1,3-dicarbonyl compounds

H4SiW12O40 Catalyzed One‐Pot Synthesis of 12‐Aryl‐8,9,10,12‐tetrahydrobenzo[a] Xanthen‐11‐ones Under Solvent‐Free Conditions

“…The solid product was purified by recrystallization from EtOH to afford the pure product. All compounds are known and their physical and spectroscopic data were in good agreement with those of authentic samples [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26] .…”

“…Tetrahydroxanthenone derivatives are generally synthesized by the three-component condensation of 2-naphthol, aryl aldehydes and cyclic 1,3-dicarbonyl compounds under different conditions. There are several reports for the synthesis of 12-aryl-8,9,10,12-Tetrahydrobenzo [a]xanthen-11-ones using catalysts such as NaHSO 4 .SiO 2 10 , Strontium triflate 11 , pTSA 12 , Indium(III) chloride or P 2 26 . However, in spite of their potential utility, some of these methods suffer drawbacks such as the use of toxic and hazardous solvents, unsatisfactory product yields, expensive catalyst, requirement of huge amounts of catalyst, purification of the products by column chromatography and prolonged reaction times.…”

Solvent-free and One-pot Facile Synthesis of 12-aryl-tetrahydrobenzo[α]xanthene-11-one Derivatives Promoted by Manganese (IV) oxide as Efficient Catalyst

“…In recent decades, a number of methodologies for preparation of these compounds have been reported that is including various catalysts [13][14][15][16][17][18][19][20][21][22]. Some of these methodologies have limitations such as difficult work-up, toxic and expensive catalysts, low yields, use of strongly acidic conditions and longtime reactions.…”

Efficient, One‐Pot Synthesis of Tetrahydrobenzo[a]xanthen‐11‐ones and Dibenzo[a,j]xanthenes Using Trichloroacetic Acid as a Solid Heterogeneous Catalyst Under Solvent‐Free Conditions

“…One-pot three-component condensation of aldehydes, 2-naphthol and cyclic 1,3-dicarbonyl compound is the most convenient method for the preparation of these compounds. In this context some methods and catalysts have been reported [7][8][9][10][11][12] . Furthermore, the synthesis of 14H-dibenzo[a,j]xanthenes and its analogous can be prepared by reaction of 2-naphthol with aldehydes in the presence of a catalyst [13][14][15][16][17] .…”