Journal
JOURNAL OF MOLECULAR STRUCTURE
Volume 1030, Issue -, Pages 168-176Publisher
ELSEVIER
DOI: 10.1016/j.molstruc.2012.04.013
Keywords
Spiropyrrolidine oxindole; Azomethine ylide; 1,3-Dipolar cycloaddition; DFT calculation; [1,5]-H shift
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Funding
- University of Mazandaran
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A series of spiropyrrolidine oxindoles was synthesized via a multicomponent 1,3-dipolar cycloaddition reaction of isatin, benzylamine and chalcone derivatives. The regio- and stereochemistry of the products were established by single crystal X-ray structure and spectroscopic techniques. The molecular mechanism of this cycloaddition has been investigated by means of a density functional theory (OFT) method. The energy path in preparing the azomethine ylide via a [1.5]-H shift in an iminium ion was evaluated. The regio- and stereoselectivity were explained on the basis of transition states stabilities, global and local reactivity indices of the reactants. The cycloaddition has been assumed to take place through one-step pathway in which two C-C bonds are formed in a nonsynchronous way. (C) 2012 Elsevier B.V. All rights reserved.
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