Chemistry of Heterocyclic Compounds

, Volume 53, Issue 4, pp 474–479 | Cite as

Spontaneous formation of tricyclic lactones following the Castagnoli–Cushman reaction

  • Liliia Usmanova
  • Olga Bakulina
  • Dmitry Dar’in
  • Mikhail KrasavinEmail author

Castagnoli–Cushman reaction of imines derived from 2-chloropyridine-3-carboxaldehyde with a cyclic anhydride (4-(methylsulfonyl)-morpholine-2,6-dione) conducted at 110°C in DMF over 1 h, as expected, led to a mixture of trans- and cis-configured carboxylic acids. However, the latter underwent a spontaneous intramolecular reaction of the carboxylic functionality onto the labile nearby 2-chloropyridine moiety to give the respective tricyclic lactones in 17–23% yield, along with 41–68% yield of the uncyclized trans-configured products (isolated as methyl esters).


tricyclic lactones-lactams Castagnoli–Cushman reaction intramolecular SNAr reaction post-MCR modification 


This research was supported by the Russian Science Foundation (project grant 14-50-00069).

NMR, mass spectrometry and X-ray diffraction studies were performed at the Research Center for Magnetic Resonance, the Center for Chemical Analysis and Materials Research and the Center for X-ray Diffraction Methods of Research park of Saint Petersburg State University.

Supplementary material

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ESM 1 (PDF 2456 kb)


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Copyright information

© Springer Science+Business Media New York 2017

Authors and Affiliations

  • Liliia Usmanova
    • 1
  • Olga Bakulina
    • 1
  • Dmitry Dar’in
    • 1
  • Mikhail Krasavin
    • 1
    Email author
  1. 1.Institute of ChemistrySaint Petersburg State UniversityPeterhofRussia

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