ISSN 0235-7216
ISSN 2424-4538 (online)
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2013 m. Nr. 2
Facile one-pot synthesis of spirocyclic (5,6,7,8-tetrahydro-
chromene)-4,3’-oxindoles using sulfonic acid functionalized nanoporous silica (SBA-Pr-SO3H)
Ghodsi Mohammadi ZIARANI, Negar LASHGARI, Alireza BADIEI, Monireh SHAKIBA
Sulfonic acid functionalized SBA-15 nanoporous material (SBA-Pr-SO3H) with a pore size of 6 nm was applied as a new and efficient heterogeneous solid acid catalyst in the one-pot, three-component synthesis of spirocyclic (5,6,7,8-tetrahydro-chromene)-4,3’-oxindoles through the reaction of isatins, dimedone, and activated methylene reagents in aqueous medium. SBA-Pr-SO3H was proved to be a recyclable, green, and highly effective solid acid catalyst which could be easily handled, recovered, and reused several times without significant loss of reactivity. The advantages of this methodology are high product yields, being environmentally benign, short reaction times, and easy handling.
Keywords: nanoporous material, SBA-Pr-SO3H, isatin, spirocyclic (5,6,7,8-tetrahydrochromene)-4,3’-oxindoles, green synthesis
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