Concise synthesis of rare pyrido1,2-apyrimidin-2-ones and related nitrogen-rich bicyclic scaffolds with a ring-junction nitrogenReport as inadecuate


Concise synthesis of rare pyrido1,2-apyrimidin-2-ones and related nitrogen-rich bicyclic scaffolds with a ring-junction nitrogen


Concise synthesis of rare pyrido1,2-apyrimidin-2-ones and related nitrogen-rich bicyclic scaffolds with a ring-junction nitrogen - Download this document for free, or read online. Document in PDF available to download.

Publication Date: 2015-11-24

Journal Title: Organic & Biomolecular Chemistry

Publisher: Royal Society of Chemistry

Volume: 14

Pages: 1031-1038

Language: English

Type: Article

Metadata: Show full item record

Citation: Alanine, T. A., Galloway, W. R. J. D., Bartlett, S., Ciardiello, J. J., McGuire, T. M., & Spring, D. R. (2015). Concise synthesis of rare pyrido[1,2-a]pyrimidin-2-ones and related nitrogen-rich bicyclic scaffolds with a ring-junction nitrogen. Organic & Biomolecular Chemistry, 14 1031-1038.

Description: This is the final version of the article. It was first available from Royal Society of Chemistry via http://dx.doi.org/10.1039/c5ob01784j

Abstract: Pyrido[1,2-a]pyrimidin-2-ones represent a pharmaceutically interesting class of heterocycles. The structurally related pyrido[1,2-a]pyrimidin-4-ones are associated with a broad range of useful biological properties. Furthermore, quinolizinone-type scaffolds of these sorts with a bridgehead nitrogen are expected to display interesting physico-chemical properties. However, pyrido[1,2-a]pyrimidin-2-ones are largely under-represented in current small molecule screening libraries and the physical and biological properties of the pyrido[1,2-a]pyrimidin-2-one scaffold have been poorly explored (indeed, the same can be said for unsaturated bicyclic compounds with a bridgehead nitrogen in general). Herein, we report the development of a new strategy for the concise synthesis of substituted pyrido[1,2-a]pyrimidin-2-ones from readily available starting materials. The synthetic route involved the acylation of the lithium amide bases of 2-aminopyridines with alkynoate esters to form alkynamides, which were then cyclised under thermal conditions. The use of lithium amide anions ensured excellent regioselectivity for the 2-oxo-isomer over the undesired 4-oxo-isomer, which offers a distinct advantage over some existing methods for the synthesis of pyrido[1,2-a]pyrimidin-2-ones. Notably, different aminoazines could also be employed in this approach, which enabled access to several very unusual bicyclic systems with higher nitrogen contents. This methodology thus represents an important contribution towards the synthesis of pyrido[1,2-a]pyrimidin-2-ones and other rare azabicycles with a ring-junction nitrogen. These heterocycles represent attractive structural templates for drug discovery.

Sponsorship: The research leading to these results has received funding from the European Research Council under the European Union's Seventh Framework Programme (FP7/2007-2013) / ERC grant agreement n° [279337/DOS]. The authors also thank AstraZeneca, the European Union (EU), the Engineering and Physical Sciences Research Council (EPSRC), the Biotechnology and Biological Sciences Research Council (BBSRC), the Medical Research Council (MRC), and the Wellcome Trust for funding. Data accessibility: all data supporting this study are provided as Supplementary Information accompanying this paper.

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This record's URL: https://www.repository.cam.ac.uk/handle/1810/253003http://dx.doi.org/10.1039/c5ob01784j

Rights: Creative Commons Attribution 4.0 International License

Licence URL: http://creativecommons.org/licenses/by/4.0/





Author: Alanine, T. A.Galloway, W. R. J. D.Bartlett, S.Ciardiello, J. J.McGuire, T. M.Spring, D. R.

Source: https://www.repository.cam.ac.uk/handle/1810/253003



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