Journal
TETRAHEDRON
Volume 67, Issue 31, Pages 5686-5692Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tet.2011.05.069
Keywords
One-pot synthesis; Spirooxindole derivatives; Multi-component reactions; 1,4-Thiazepine derivatives
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Funding
- Foundation of the Natural Science Foundation of China [21072144]
- Natural Science Foundation of the Jiangsu Higher Education Institutions [10KJA150049]
- Jiangsu Higher Education Institutions
- Foundation of Key Laboratory of Organic Synthesis of Jiangsu Province [JSK0812]
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An efficient one-pot synthesis of spiro[indoline-3,4'-pyrazolo[3,4-e][1,4]thiazepine] dione derivatives via three-component reaction of 5-amino-3-methylpyrazole, isatin, and thioacid is described. This new protocol produces novel heptacyclic spirooxindole derivatives in good yields in comparison to conventional pentacyclic compounds. This method proceeds through a 3-(5-aminopyrazol-3-yl)-3-hydroxy-2-oxindoline intermediate (Baylis-Hillman type adduct), unlike 3-indolylimine (the intermediate like Shiff-Bases) as in conventional methods. The structure of one representative compound has been confirmed by X-ray diffraction analysis. (C) 2011 Published by Elsevier Ltd.
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