Journal
TETRAHEDRON LETTERS
Volume 53, Issue 28, Pages 3603-3606Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tetlet.2012.05.019
Keywords
Spirooxindole; Isatin; Acetylenic ester; Organocatalytic reaction
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Funding
- Research Council of Shahid Beheshti University
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A practical, simple, and efficient method for the synthesis of pyrano-fused spirooxindoles via an organocatalytic three-component reaction of isatins, malononitrile, and dialkyl acetylenedicarboxylate in the presence of 3,4-dimethylaniline as an organocatalyst in ethanol is reported. The structures of these products are confirmed by IR, H-1 NMR and C-13 NMR spectroscopy, mass spectrometry, and single-crystal X-ray diffraction studies. (C) 2012 Elsevier Ltd. All rights reserved.
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