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Kapur A.,Guru Nanak Dev University | Kapur A.,Post Graduate Dav College | Sharma V.,Guru Nanak Dev University | Kaur A.,Guru Nanak Dev University | And 4 more authors.
Tetrahedron Letters | Year: 2015

Thermal reactions of 3-(N-aryliminomethyl)chromones (4a-d) with ethyl 2,3-butadienoate (5a) and ethyl 4-phenyl-2,3-butadienoate (5b), on refluxing in dry benzene, afford novel compounds 6a-e, apparently, derived from tandem reorganization of initially formed [2+2] cycloadducts. However, reaction of 4a,d with ethyl 2,3-pentadienoate (5c, R = CH3) under similar condition follows a different course yielding novel molecules 7a,d and 8a,d. Plausible mechanistic rationale for the formation of new molecules is proffered. © 2015 Elsevier Ltd. All rights reserved.

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