Quadruple C-H activation coupled to hydrofunctionalization and C-H silylation/borylation enabled by weakly coordinated palladium catalyst

Bo-Cheng Tang, Wen-Xuan Lin, Xiang-Long Chen, Cai He, Jin-Tian Ma, Yan-Dong Wu, Yu Lan () and An-Xin Wu ()
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Bo-Cheng Tang: Central China Normal University
Wen-Xuan Lin: Zhengzhou University
Xiang-Long Chen: Central China Normal University
Cai He: Central China Normal University
Jin-Tian Ma: Central China Normal University
Yan-Dong Wu: Central China Normal University
Yu Lan: Zhengzhou University
An-Xin Wu: Central China Normal University

Nature Communications, 2020, vol. 11, issue 1, 1-12

Abstract: Abstract Unlike the well-reported 1,2-difunctionalization of alkenes that is directed by classic pyridine and imine-containing directing groups, oxo-palladacycle intermediates featuring weak Pd-O coordination have been less demonstrated in C-H activated cascade transformations. Here we report a quadruple C-H activation cascade as well as hydro-functionalization, C-H silylation/borylation sequence based on weakly coordinated palladium catalyst. The hydroxyl group modulates the intrinsic direction of the Heck reaction, and then acts as an interrupter that biases the reaction away from the classic β-H elimination and toward C-H functionalization. Mechanistically, density functional theory calculation provides important insights into the key six-membered oxo-palladacycle intermediates, and indicates that the β-H elimination is unfavorable both thermodynamically and kinetically. In this article, we focus on the versatility of this approach, which is a strategic expansion of the Heck reaction.

Date: 2020
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DOI: 10.1038/s41467-020-19508-z

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