Kostanecki acylation

The Kostanecki acylation is a method used in organic synthesis to form chromones[1] or coumarins[2] by acylation of O-hydroxyaryl ketones with aliphatic acid anhydrides, followed by cyclization.[3] If benzoic anhydride (or benzoyl chloride) is used, a particular type of chromone called a flavone is obtained.

## Contents

* 1 Mechanism
* 2 Examples
* 3 See also
* 4 References

## Mechanism

The mechanism consists of three well-differentiated reactions:[4][5]

1. Phenol O-acylation with formation of a tetrahedral intermediate
2. Intramolecular aldol condensation to cyclize and to form a hydroxydihydrochromone
3. Elimination of the hydroxyl group to form the chromone (or coumarin)

## Examples

* Alvocidib (flavopiridol)
* Dimefline
* Flavoxate

## See also

* Allan–Robinson reaction
* Baker–Venkataraman rearrangement

## References

1. ↑ Gaspar, A.; Matos, M. J. O.; Garrido, J.; Uriarte, E.; Borges, F. (2014). "Chromone: A Valid Scaffold in Medicinal Chemistry". Chemical Reviews 114 (9): 4960–92. doi:10.1021/cr400265z. PMID 24555663. https://repositorio-aberto.up.pt/handle/10216/70808.
2. ↑ Sethna, S. M.; Shah, N. M. (1945). "The Chemistry of Coumarins". Chemical Reviews 36: 1–62. doi:10.1021/cr60113a001.
3. ↑ v. Kostanecki, St.; Różycki, A. (1901). "Ueber eine Bildungsweise von Chromonderivaten". Berichte der Deutschen Chemischen Gesellschaft 34: 102–109. doi:10.1002/cber.19010340119. https://zenodo.org/record/1426000.
4. ↑ Mamedov, V. A.; Kalinin, A. A.; Gubaidullin, A. T.; Litvinov, I. A.; Levin, Ya. A. (2003). "3-Benzoylquinoxalin-2(1H)-one in the Kostanecki-Robinson Reaction. Synthesis and Structure of 2-Oxo-4-phenylpyrano[2,3-bquinoxaline"]. Chemistry of Heterocyclic Compounds 39 (1): 96–100. doi:10.1023/A:1023028927007. http://link.springer.com/10.1023/A:1023028927007.
5. ↑ Ellis, G. P. (1977) Chromenes, Chromanones, and Chromones from The Chemistry of Heterocyclic Compounds, Weissberger, A. and Taylor, E. C., eds.; Wiley & Sons: New York, vol. 31, p. 495.

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