Synthesis 2021; 53(18): 3307-3324
DOI: 10.1055/a-1472-0881
special topic
Bond Activation – in Honor of Prof. Shinji Murai

Pd(II)-Catalyzed Directing-Group-Aided C–H Arylation and Alkylation of Pyrene Core: Synthesis of C1,C2- and C1,C10-Disubstituted Pyrene Motifs

Arup Dalal
,
S.A.B. thanks the Science and Engineering Research Board (SERB), the Department of Science and Technology (DST), New Delhi, India, for funding (Grant No. EMR/2017/002515). S.A.B. thanks IISER Mohali for funding initial part of this research. A.D. thanks IISER Mohali for providing a PhD fellowship.


Abstract

We report the application of the Pd(II)-catalyzed, directing-group-aided C–H arylation/alkylation tactics to functionalize the pyrene core, especially, the relatively inaccessible C2 and K-region C10 positions of the pyrene core and augmentation of the library of pyrene derivatives with C1,C2- and C1,C10-disubstituted pyrene motifs. The Pd(II)-catalyzed β-C–H arylation/alkylation of the C2-position of pyrene-1-carboxamide possessing an 8-aminoquinoline directing group yielded various C1,C2-disubstituted pyrenes. Similarly, the Pd(II)-catalyzed selective γ-C–H arylation/alkylation of the C10-position of N-(pyren-1-yl)picolinamide, possessing a picolinamide directing group, yielded various C1,C10-disubstituted pyrenes. Examples of C(9)–H arylation of pyrene-1-carboxamide and the removal of the directing group after the C–H arylation/alkylation reactions were also shown. The structures of representative pyrene derivatives were confirmed by the X-ray structure analysis. Given the importance of the pyrene derivatives in various fields of chemical sciences, this report is a contribution towards augmentation of the library of pyrene derivatives with C1,C2- and C1,C10-disubstituted pyrene amide motifs.

Supporting Information



Publication History

Received: 09 March 2021

Accepted after revision: 31 March 2021

Accepted Manuscript online:
31 March 2021

Article published online:
26 April 2021

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