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Synthesis 2023; 55(21): 3693-3699
DOI: 10.1055/a-2124-5485
DOI: 10.1055/a-2124-5485
special topic
C–H Bond Functionalization of Heterocycles
Photocatalyst-Free Visible-Light-Promoted C–H Selenylation of Pyrazolo[1,5-a]pyrimidines
A.K.B. acknowledges the SERB, DST (File no. EEQ/2018/000498) and University of Kalyani (PRG) for financial support. P.S. acknowledges Govt. of West Bengal for her SVMCM Fellowship. T.C. (URS) acknowledges the University of Kalyani for his fellowship. S.P. (CSIR-JRF) and S.D. (UGC-JRF) acknowledge the CSIR-New Delhi and UGC-New Delhi for their fellowships. The authors also acknowledge DST New Delhi for HRMS Facility at BITS Pilani, Pilani Campus under FIST scheme (SR/FST/CSI-270/2015).
Abstract
A new method has been developed for the C–H selenylation of pyrazolo[1,5-a]pyrimidine derivatives under the irradiation of visible light. This photocatalyst-free strategy is applicable to a wide range of pyrazolo[1,5-a]pyrimidines with broad functionalities. The salient features of the method are mild reaction conditions, use of bench-stable oxidant, high regioselectivity, and scalability.
Key words
photocatalyst-free - C–H selenylation - pyrazolo[1,5-a]pyrimidine - persulfate - visible lightSupporting Information
- Supporting information for this article is available online at https://doi.org/10.1055/a-2124-5485.
- Supporting Information
Publication History
Received: 10 April 2023
Accepted after revision: 06 July 2023
Accepted Manuscript online:
06 July 2023
Article published online:
21 August 2023
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