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Biopolymeric alginic acid: an efficient recyclable green catalyst for the Friedel–Crafts reaction of indoles with isoquinoline-1,3,4-triones in water
- Srivastava, Anvita, Yadav, Anubha, Samanta, Sampak
- Tetrahedron letters 2015 v.56 pp. 6003-6007
- alginates, catalysts, chemical reactions, chemical structure, indoles
- A very cheap, naturally available, nontoxic and biopolymeric alginic acid has been found to be an efficient, recyclable and heterogeneous green catalyst for the Friedel–Crafts reactions of indoles at C-3 and C-2 positions with isoquinoline-1,3,4-triones and hydroxyindolyl derivatives in water under mild conditions. These operational simple procedures furnish good to high yields of corresponding synthetically as well as biologically interesting functionalized 4-hydroxy-4-indolylisoquinoline-1,3(2H,4H)-diones and 4,4-diindolylisoquinoline-1,3(2H,4H)-diones, respectively. Moreover, alginic acid could be recovered and reused several times (up to 5 times) without significant loss in activity.