A new and efficient method for the synthesis of hitherto unreported spiro[benzo[4,5]thiazolo[3,2-a] chromeno[2,3-d]pyrimidine-14,3'-indoline]-1,2',13(2H)-triones was developed via the Domino Knoevenagel condensation-Michael addition-intermolecular cyclization sequences of isatin derivatives, cyclohexane-1,3-diones, and 2-hydroxy-4H-benzo14,51thiazolo[3,2-a]pyrimidin-4-ones, employing 12-tungstophosphoric acid (H3PW12O40) as an effective and inexpensive catalyst. (C) 2018 Elsevier Ltd. All rights reserved.
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Islamic Azad Univ, Tehran Med Sci, Act Pharmaceut Ingredients Res Ctr APIRC, Tehran, IranIslamic Azad Univ, Tehran Med Sci, Act Pharmaceut Ingredients Res Ctr APIRC, Tehran, Iran
Gholami, Mahdieh
Youseftabar-Miri, Leila
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Islamic Azad Univ, Tehran Med Sci, Dept Organ Chem, Fac Pharmaceut Chem, Tehran, IranIslamic Azad Univ, Tehran Med Sci, Act Pharmaceut Ingredients Res Ctr APIRC, Tehran, Iran
Youseftabar-Miri, Leila
Askarizadeh, Elham
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Islamic Azad Univ, Tehran Med Sci, Dept Appl Chem, Fac Pharmaceut Chem, Tehran, IranIslamic Azad Univ, Tehran Med Sci, Act Pharmaceut Ingredients Res Ctr APIRC, Tehran, Iran
Askarizadeh, Elham
Hosseinjani-Pirdehi, Hamide
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Tarbiat Modares Univ, Dept Chem, Tehran 14115175, IranIslamic Azad Univ, Tehran Med Sci, Act Pharmaceut Ingredients Res Ctr APIRC, Tehran, Iran
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Ferdowsi University of Mashhad,Department of Chemistry, Faculty of ScienceFerdowsi University of Mashhad,Department of Chemistry, Faculty of Science
Maryam Khalili
Abbas Ali Esmaeili
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Ferdowsi University of Mashhad,Department of Chemistry, Faculty of ScienceFerdowsi University of Mashhad,Department of Chemistry, Faculty of Science