Highly efficient hydroboration of alkynes catalyzed by porous copper-organic framework under mild conditions

• Published in: Journal of catalysis Vol. 404; pp. 250 - 257
• Main Authors: Wu, Zhi-Lei, Lan, Xingwang, Gao, Ning, Kang, Xiaomin, Wang, Zhenguang, Hu, Tianding, Zhao, Bin
• Format: Journal Article
• Language: English
• Published: Elsevier Inc 01.12.2021
• Subjects: Copper−organic framework; DFT calculation; High turnover frequency; Hydroboration of alkynes; Under mild conditions; High turnover frequency; DFT calculation; Hydroboration of alkynes; Under mild conditions; Copper−organic framework
• ISSN: 0021-9517; 1090-2694
• DOI: 10.1016/j.jcat.2021.09.033

[Display omitted] •A new Cu-MOF with mixed-valence Cu(I) and Cu(II) blocks was synthesized.•MOF catalyst was used for the hydroboration of alkynes with B2Pin2.•The TOF of 1 can reach to a record value of 310 h−1.•The mechanism is clarified by DFT calculations. The hydroboration of alkynes is crucial due to the wide applications in organic synthesis, while such reaction is often completed with low turnover frequency (TOF) value and long reaction time. Therefore, it is very important and necessary that the hydroboration of alkynes is performed with high TOF value, however the corresponding investigations have been never reported hitherto. Herein, a new Cu-organic framework 1 with mixed-valence Cu(I) and Cu(II) blocks was successfully synthesized and employed for the hydroboration of alkynes with bis(pinacolato)diboron (B2Pin2). 1 displays good thermostability and excellent solvent stability. Catalytic explorations reveal that 1 can serve as a high efficient heterogeneous catalyst for this reaction with a record TOF value of 310 h−1 under mild conditions, and 1 as catalysts which can be recycled at least five times without adding any cocatalysts. Mechanism investigations suggest that the Cu(I) and Cu(II) clusters in the framework of 1 have a synergistic catalytic effect in the hydroboration of alkynes, which can effectively activate the alkyne to react with B2Pin2. The density functional theory (DFT) calculations explicitly elucidate the reaction pathways, and the results indicate that the Cu(I) and Cu(II) clusters in 1 as the catalytic sites can greatly reduce the Gibbs free energy of the hydroboration of alkyne indifferentdegree, which accounts for the high catalytic activity of 1.