The intramolecular oxidative coupling of electron-rich aromatic groups in 5-(het)aryl-1-(het)arylalkyl-1H-1,2,3-triazoles was studied in detail. Under treatment with phenyliodoso bis(trifluoroacetate) and boron trifluoride etherate these substrates afforded products of either ortho/ortho or ortho/ipso coupling depending on the nature of aromatic groups and reaction conditions applied. It was found that for substrates which are capable for both types of coupling, ortho-/ipso-adducts are formed under kinetic control while ortho-/ortho-products are formed under thermodynamic control. The developed procedures allow preparation of complex polycyclic azaheterocycles from simple precursors in two steps only.
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This work was supported by Russian Science Foundation (grant 18-13-00449).
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Published in Khimiya Geterotsiklicheskikh Soedinenii, 2021, 57(7/8), 817–822
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Boichenko, M.А., Anisovich, K.V., Shad, M.S. et al. Oxidative cyclization of 5-aryl-1-benzyl-1,2,3-triazoles bearing electron-rich aromatic groups: ortho/ortho and ortho/ipso coupling. Chem Heterocycl Comp 57, 817–822 (2021). https://doi.org/10.1007/s10593-021-02985-5
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DOI: https://doi.org/10.1007/s10593-021-02985-5