Organometallics p. 2907 - 2916 (2020)
Update date:2022-08-11
Topics:
Bayrakdar, Tahani A.C.A.
Nahra, Fady
Davis, Jack V.
Gamage, Mohan M.
Captain, Burjor
Temprado, Manuel
Marazzi, Marco
Saab, Marina
van Hecke, Kristof
Ormerod, Dominic
Hoff, Carl D.
Nolan, Steven P.
Eight new dinuclear gold(I) complexes, [Au2(L)X2] (1?8), were synthesized using a straightforward synthetic procedure under very mild conditions. The complexes have been characterized by NMR spectroscopy, elemental analysis, and single-crystal X-ray structure analysis. Their catalytic activity was investigated in the carboxylative cyclization of propargylamine (PPA). A superior performance in comparison to [Au(IPr)Cl] (9) was obtained for complexes 1 and 2 having an eight-methylene bridge connecting two NHCs with an arene bearing an isopropyl substituent for X = Cl, Br. This prompted more detailed kinetic and mechanistic studies by FTIR comparing dinuclear complex 2 of X = Cl to complex 9. Fortuitously the FTIR studies allowed monitoring of the formation of the products carbamic acid (CA) and carbamate salt (CS), as well as a key cyclized intermediate first discovered by Ikariya. These data allow additional insight into the mechanism as well as the central role which may be played by Au(I) carbamate formation as a higher energy resting state present in the catalytic cycle. The crystal structures of four of the new complexes and a detailed computational study relevant to the role of carbamic acid (CA) and carbamates in the catalytic cycle are also reported.
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(2021)