Nickel-catalyzed electrophiles-controlled enantioselective reductive arylative cyclization and enantiospecific reductive alkylative cyclization of 1,6-enynes

Wenfeng Liu, Yunxin Xing, Denghong Yan, Wangqing Kong () and Kun Shen ()
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Wenfeng Liu: Wuhan University
Yunxin Xing: Zhongnan Hospital of Wuhan University, School of Pharmaceutical Sciences, Wuhan University
Denghong Yan: Zhongnan Hospital of Wuhan University, School of Pharmaceutical Sciences, Wuhan University
Wangqing Kong: Wuhan University
Kun Shen: Zhongnan Hospital of Wuhan University, School of Pharmaceutical Sciences, Wuhan University

Nature Communications, 2024, vol. 15, issue 1, 1-14

Abstract: Abstract Transition metal-catalyzed asymmetric cyclization of 1,6-enynes is a powerful tool for the construction of chiral nitrogen-containing heterocycles. Despite notable achievements, these transformations have been largely limited to the use of aryl or alkenyl metal reagents, and stereoselective or stereospecific alkylative cyclization of 1,6-enynes remains unexploited. Herein, we report Ni-catalyzed enantioselective reductive anti-arylative cyclization of 1,6-enynes with aryl iodides, providing enantioenriched six-membered carbo- and heterocycles in good yields with excellent enantioselectivities. Additionally, we have realized Ni-catalyzed enantiospecific reductive cis-alkylative cyclization of 1,6-enynes with alkyl bromides, furnishing chiral five-membered heterocycles with high regioselectivity and stereochemical fidelity. Mechanistic studies reveal that the arylative cyclization of 1,6-enynes is initiated by the oxidative addition of Ni(0) to aryl halides and the alkylative cyclization is triggered by the oxidative addition of Ni(0) to allylic acetates. The utility of this strategy is further demonstrated in the enantioselective synthesis of the antiepileptic drug Brivaracetam.

Date: 2024
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DOI: 10.1038/s41467-024-45617-0

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