DFT Study of Functional Reduction of CO2 with BH3NMe3: The Real Role of Organic Catalyst TBD
The Journal of Organic Chemistry(2024)
摘要
The detailed mechanism of transition metal-free-catalyzed monomethylation of 2-naphthyl acetonitrile (1a) with CO2 in the presence of triazabicyclodecene (TBD) and BH3NMe3 was investigated using density functional theory. The C-methylation process proved to generate formaldehyde followed by the formation of the product via an alcohol rather than a methoxyborane intermediate. During the reaction, CO2 is activated to form the TBD-CO
2
adduct and BH3NMe3 is changed into TBD-BH
2
(IM2) in the presence of TBD. IM2 plays a real reducing role within the system due to the unique coordination capability of the B atom. In addition to enhancing the nucleophilicity of 1a through deprotonation by
t
BuOK, our research also indicates that the generated
t
BuOH not only assists in proton transfer to generate an alcohol intermediate but also promotes the regeneration of TBD.
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