Abstract
The cross-dimerization of terminal alkynes is the most straightforward and attractive approach to differently substituted 1,3-enynes, which are vital structural motifs in natural products, biologically active compounds, and organic functional materials, etc. However, due to the inherent issues of the stereo-, regio-, and chemoselectivity, the strategy is less explored and remains problematic in substrate scope, selectivity, and screening of catalytic system, etc. Herein, a specific cross-dimerization of terminal alkynes is developed under Pd/TMEDA catalysis, which produces a series of gem-1,3-enynes (58 examples) in totally moderate to high yields with outstanding functional group tolerance. A cyclopalladium compound might be the key imtermediate, which performs anti-addition-carbometallation, and leads to the exclusive cross-selectivity. The unprecedented features of the reaction, such as anti-addition-carbometallation, easy control of selectivity, wide range of the donor alkynes, and very simple catalytic conditions, allow it not only a facile and functionally diverse synthesis of 1,3-enynes, but also a substantial progress for the textbook reaction.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (21878072, 21706058, 22102062, 21725602), the Hunan Provincial Natural Science Foundation of China (2020JJ2011) and the China Postdoctoral Science Foundation (2019M662774).
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Liu, L., Dong, J., Fu, Z. et al. Specific cross-dimerization of terminal alkynes via Pd/TMEDA catalysis. Sci. China Chem. 65, 2487–2493 (2022). https://doi.org/10.1007/s11426-022-1388-5
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DOI: https://doi.org/10.1007/s11426-022-1388-5