Alkyl halides as both hydride and alkyl sources in catalytic regioselective reductive olefin hydroalkylation

Xianxiao Chen, Weidong Rao, Tao Yang () and Ming Joo Koh ()
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Xianxiao Chen: Nanjing Forestry University
Weidong Rao: Nanjing Forestry University
Tao Yang: National University of Singapore
Ming Joo Koh: National University of Singapore

Nature Communications, 2020, vol. 11, issue 1, 1-9

Abstract: Abstract Among the plethora of catalytic methods developed for hydrocarbofunctionalization of olefins to date, reactions that regioselectively install a functionalized alkyl unit at the 2-position of a terminal unactivated C=C bond to afford branched products are scarce. Here, we show that a Ni-based catalyst in conjunction with a stoichiometric reducing agent promote Markovnikov-selective hydroalkylation of unactivated alkenes tethered to a recyclable 8-aminoquinaldine directing auxiliary. These mild reductive processes employ readily available primary and secondary haloalkanes as both the hydride and alkyl donor. Reactions of alkenyl amides with ≥ five-carbon chain length regioselectively afforded β-alkylated products through remote hydroalkylation, underscoring the fidelity of the catalytic process and the directing group’s capability in stabilizing five-membered nickelacycle intermediates. The operationally simple protocol exhibits exceptional functional group tolerance and is amenable to the synthesis of bioactive molecules as well as regioconvergent transformations.

Date: 2020
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DOI: 10.1038/s41467-020-19717-6

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