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DOI: 10.1055/a-2159-1611
Nitrene Cyclization of 2-(Trichloromethyl)-5-phenylpyrimidines: Application to the Synthesis of 2-(Trichloromethyl)pyrimido[4,5-b]indoles and Related Heterocycles
Financial support for this research was provided by the Secretaría de Investigación y Estudios Avanzados – Universidad Autónoma del Estado de México (SIEA – UAEMéx) (grant number 6162/2020CIB).


Abstract
An aromatic C–H nitrene insertion of 2-(trichloromethyl)pyrimidines bearing a phenyl substituent at the C-5 position is described. Treatment of 4-chloro-5-phenyl-2-(trichloromethyl)pyrimidines with sodium azide in DMF or the reflux of 4-azido-5-phenyl-2-(trichloromethyl)pyrimidines in toluene provided 2-(trichloromethyl)pyrimido[4,5-b]indole derivatives in moderate yields. Excellent yields of this heterocyclic system were obtained through the aromatic C–H insertion with the Du Bois catalyst. This is an attractive approach for synthesizing pyrimido[4,5-b]indoles with a trichloromethyl substituent in the pyrimidine moiety.
Key words
nitrene insertion - 5-phenylpyrimidines - pyrimido[4,5-b]indoles - trichloromethylated heterocycles - Du Bois catalyst - intramolecular cyclizationSupporting Information
- Supporting information for this article is available online at https://doi.org/10.1055/a-2159-1611.
- Supporting Information
Publication History
Received: 14 July 2023
Accepted after revision: 23 August 2023
Accepted Manuscript online:
23 August 2023
Article published online:
04 October 2023
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