Abstract
Novel 2-amino-7-methyl-4-aryl-3-(phenylsulfonyl) pyrano[4,3-b]pyran-5(4H)-one derivatives containing both biologically active pyran and chromene templates are synthesized via one-pot three-component condensation of aromatic aldehydes, 4-hydroxy-6-methyl-2H-pyran-2-one and phenylsulfonylacetonitrile in the presence of nano kaolin/TiCl4 as an efficient and recyclable acid catalyst. Many instrumental techniques including TEM, FE-SEM, and EDX, confirmed the structure of applied nano kaolin supported titanium tetrachloride. The proposed approach has some advantages as excellent yields, mild reaction conditions, eco-friendly, ease of work-up, survival of different functional groups and short reaction times.
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