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. Source