期刊
JOURNAL OF ORGANIC CHEMISTRY
卷 82, 期 7, 页码 3639-3647出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.joc.7b00167
关键词
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资金
- National Nature Science Foundation of China [21133004, 21373167, 21573178]
- Fundamental Research Funds for the Central Universities [20720160046, 20720150043]
- Program for Innovative Research Team in Chinese Universities [IRT_14R31]
Density functional theory calculations have been carried out to explore the detailed mechanisms for carbon dioxide incorporation of N-unsubstituted propargylic amine catalyzed by Ag(I) catalysts. We show that the reaction undergoes substrate adsorption or displacement, isomerization from amine-coordinated species to the alkyne-coordinated species, CO, attack, and proton transfer, giving the carbamate intermediate. Subsequently, the reaction would bifurcate at the intermolecular ring-closing step, which produces five-membered ring (5MR) and six-membered ring (6MR) products at the same time, thus raising a regioselectivity issue. Our calculations reveal that the outcomes of the reaction critically depend on the coordination number and the basicity of the ligands. Higher coordinate number and stronger basicity of the ligands would stabilize the 5MR. transition state over the 6MR counterpart. Such a preference can be rationalized by using transition state energy decomposition. All of these results could promote the rational design of noble metal/organic base combined catalysts with higher selectivity.
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