Abstract
Terminal secondary 4-chlorophenyl propargylamines, synthesized by addition of acetylene to N-(4-chlorophenyl)ketimines (ButOK, DMSO, 20–25 °C) in 76–93% yields, in the presence of the PdCl2/CuI/Ph3P catalytic system cross-coupled with aromatic and heteroaromatic acyl chlorides at the terminal carbon atom of the acetylenic unit to give chemoselectively β-[(4-chlorophenyl)amino]acetylenic ketones in 80–85% yields. Under these conditions, neither expected acylation of the NH-bond nor possible intramolecular cross-coupling involving carbon atom of 4-chlorophenylamine substituent occurred.
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Funding
This work was financially supported by the Russian Science Foundation (Project No. 19-13-00052 (synthesis of propargylamines, aza-Favorskii reaction) and No. 18-73-10080P (acylation of propagylamines)) using the equipment of Baikal Analytical Joint Use Center of the Siberian Branch of the Russian Academy of Sciences.
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Dedicated to Academician of the Russian Academy of Sciences V. I. Ovcharenko on the occasion of his 70th birthday.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 7, pp. 1514–1518, July, 2022.
No human or animal subjects were used in this research.
The authors declare no competing interests.
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Volkov, P.A., Khrapova, K.O., Bidusenko, I.A. et al. Chemoselective cross-coupling of terminal propargylamines with (het)aroyl chlorides: synthesis of β-aminoacetylenic ketones bearing aromatic and heteroaromatic substituents. Russ Chem Bull 71, 1514–1518 (2022). https://doi.org/10.1007/s11172-022-3558-3
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DOI: https://doi.org/10.1007/s11172-022-3558-3