Journal of Chemical Crystallography

, Volume 48, Issue 3, pp 91–95 | Cite as

Crystal Structure of Ethyl 2,4-Dimethyl-1-phenyl-6-thioxo-1,6-dihydropyrimidine-5-carboxylate: The Product from the Reaction of Ethyl 3-Aminocrotonate, Phenylisothiocyanate and Acetic Anhydride

  • Peter J. Cossar
  • Cecilia C. Russell
  • Siobhann N. McCluskey
  • Dylan Pope
  • Paul V. Bernhardt
  • Adam McCluskey
Original Paper


The crystal structure of ethyl 2,4-dimethyl-1-phenyl-6-thioxo-1,6-dihydropyrimidine-5-carboxylate (7) has been determined (monoclinic, P21/n, a 12.5543(9); b 7.6345(4); c 16.1568(14) Å, β 107.210(9)°) revealing a thioamide functional group instead of the thiazine ethyl (Z)-2,4-dimethyl-6-(phenylimino)-6H-1,3-thiazine-5-carboxylate (5) proposed previously. This has required the revision of the published structure for this multicomponent reaction which now has identified (7), not (5), as the product, supported by NMR and IR analysis.

Graphical Abstract

The crystal structure of the major product from the reaction of ethyl 3-aminocrotonate, phenylisothiocyanate and acetic anhydride is ethyl 2,4-dimethyl-1-phenyl-6-thioxo-1,6-dihydropyrimidine-5-carboxylate (shown), not the previously identified ethyl (Z)-2,4-dimethyl-6-(phenylimino)-6H-1,3-thiazine-5-carboxylate.


Multicomponent reaction Thiazine Dihydropyrimidine Structure revision 



The authors acknowledge the financial support of the Australian Research Council, the Australian Cancer Research and Ramaciotti Foundations.

Supplementary material

10870_2018_714_MOESM1_ESM.pdf (110 kb)
Supplementary material 1 (PDF 110 KB)


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© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Chemistry, School of Environmental and Life SciencesUniversity of NewcastleCallaghanAustralia
  2. 2.School of Chemistry and Molecular BiosciencesUniversity of QueenslandBrisbaneAustralia

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