Eco-friendly synthesis of tetrahydrobenzo[c]xanthenes catalyzed by functional ionic liquid in water

A convenient, simple and one-pot synthesis of dibenzoxanthenes and tetrahydrobenzoxanthenes by nanotitania-supported sulfonic acid as an efficient and highly reusable nanocatalyst

“…Additionally, its derivatives can be used as dyes, pH-sensitive fluorescent materials in laser technologies and in photodynamic therapy, too [13][14][15][16]. Owing to its wide range of applications, several protocols have been reported in the literatures for its synthesis [17][18][19][20][21][22].…”

Immobilization of Lewis acidic ionic liquid on perlite nanoparticle surfaces as a highly efficient solid acid catalyst for the solvent-free synthesis of xanthene derivatives

“…On the other hand, fused pyran ring systems especially pyranopyrimidines have biological activities including antimicrobial, 6 anticonvulsant, 7 antiplatelet, 8 antibacterial, 9 antiphlogistic, 10 analgesic, 11 anti-inammatory, 11 antigenotoxic 12 and antifungal activities. 7,[13][14][15] These unique properties, led to intensive research on the synthesis of xanthene and naphthopyranopyrimidine derivatives in the presence of various catalysts such as CoPy 2 Cl 2 , 16 I 2 , 17 choline chloride, 18 Y(NO 3 ) 3 $6H 2 O and SnCl 2 $2H 2 O, 19 ZnO NPs, 20 Al(HSO 4 ) 3 , 21 sulfamic acid, 22 perlite-SO 3 H, 23 LiBr, 24 silica sulfuric acid, 25 (nBu) 4 NBr, 26 TfOH, 27 cellulose sulfamic acid, 28 molecular iodine, 29 heteropolyacid, 30 phosphoric acid supported on alumina, 31 [IMPS][TfO], 32 [HNMP][HSO 4 ], 33 [TEBSA] [HSO 4 ], 34 [MIMPS][HSO 4 ], 35 [DMEA][HSO 4 ], 36 [BDMAP][OH] 37 and sulfonyl-functionalized acidic ionic liquids. 38 In recent years, the application of supported catalysts was developed for the synthesis of organic compounds.…”