An efficient two-step synthesis of indole-annulated dihydropyrano[3,4-c]chromene derivatives is achieved via Knoevenagel condensation of O-propargylated salicylaldehyde derivatives with indolin-2-ones followed by a microwave-assisted intramolecular-hetero-Diels-Alder reaction of the resulting (Z)-3-(2-(prop-2-ynyloxy)benzylidene)indolin-2-ones in the presence of 20 mol % Cul in acetonitrile. (C) 2011 Elsevier Ltd. All rights reserved.
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Indian Inst Chem Technol, Div Organ & Biomol Chem, CSIR, Hyderabad 500007, Andhra Pradesh, IndiaIndian Inst Chem Technol, Div Organ & Biomol Chem, CSIR, Hyderabad 500007, Andhra Pradesh, India
Madda, Jyothi
Venkatesham, Akkaladevi
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Indian Inst Chem Technol, Div Organ & Biomol Chem, CSIR, Hyderabad 500007, Andhra Pradesh, IndiaIndian Inst Chem Technol, Div Organ & Biomol Chem, CSIR, Hyderabad 500007, Andhra Pradesh, India
Venkatesham, Akkaladevi
Bejjanki, Naveen Kumar
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Indian Inst Chem Technol, Div Organ & Biomol Chem, CSIR, Hyderabad 500007, Andhra Pradesh, IndiaIndian Inst Chem Technol, Div Organ & Biomol Chem, CSIR, Hyderabad 500007, Andhra Pradesh, India
Bejjanki, Naveen Kumar
Kommu, Nagaiah
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Indian Inst Chem Technol, Div Organ & Biomol Chem, CSIR, Hyderabad 500007, Andhra Pradesh, IndiaIndian Inst Chem Technol, Div Organ & Biomol Chem, CSIR, Hyderabad 500007, Andhra Pradesh, India
Kommu, Nagaiah
Pombala, Sujitha
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Indian Inst Chem Technol, CSIR, Med Chem & Pharmacol Div, Hyderabad 500007, Andhra Pradesh, IndiaIndian Inst Chem Technol, Div Organ & Biomol Chem, CSIR, Hyderabad 500007, Andhra Pradesh, India
Pombala, Sujitha
Kumar, C. Ganesh
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Indian Inst Chem Technol, CSIR, Med Chem & Pharmacol Div, Hyderabad 500007, Andhra Pradesh, IndiaIndian Inst Chem Technol, Div Organ & Biomol Chem, CSIR, Hyderabad 500007, Andhra Pradesh, India
Kumar, C. Ganesh
Rao, Tadikamalla Prabhakar
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Indian Inst Chem Technol, CSIR, Ctr Nucl Magnet Resonance, Hyderabad 500007, Andhra Pradesh, IndiaIndian Inst Chem Technol, Div Organ & Biomol Chem, CSIR, Hyderabad 500007, Andhra Pradesh, India
Rao, Tadikamalla Prabhakar
Nanubolu, Jagadeesh Babu
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Indian Inst Chem Technol, CSIR, Xray Crystallog Lab, Hyderabad 500007, Andhra Pradesh, IndiaIndian Inst Chem Technol, Div Organ & Biomol Chem, CSIR, Hyderabad 500007, Andhra Pradesh, India