Synthesis 2023; 55(24): 4204-4212
DOI: 10.1055/a-2159-1611
paper

Nitrene Cyclization of 2-(Trichloromethyl)-5-phenylpyrimidines: Application to the Synthesis of 2-(Trichloromethyl)pyrimido[4,5-b]indoles and Related Heterocycles

Ulises J. Vargas-Cruz
a   Department of Organic Chemistry, Universidad Autónoma del Estado de México, Toluca, Estado de México, 50180, México
,
José G. Peralta-Chávez
a   Department of Organic Chemistry, Universidad Autónoma del Estado de México, Toluca, Estado de México, 50180, México
,
Misael A. Romero-Reyes
b   Department of Chemistry, Georgia Gwinnett College, Lawrenceville, GA, 30043, USA
,
Diego Martínez-Otero
c   Centro Conjunto de Investigación en Química Sustentable UAEM-UNAM, Toluca, México
,
a   Department of Organic Chemistry, Universidad Autónoma del Estado de México, Toluca, Estado de México, 50180, México
› Author Affiliations
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.

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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