Synthesis 2024; 56(13): 1989-1998
DOI: 10.1055/a-2323-0633
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Remote-Carbonyl-Directed Consecutive Arylation of Terminal Alkenes for the Synthesis of Tetrasubstituted Olefins

Kun Li
a   College of Chemistry & Materials Science, Fujian Normal University, Fuzhou 350007, P. R. of China
b   State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, 155 Yangqiao Road West, Fuzhou 350002, P. R. of China
,
Runze Luan
b   State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, 155 Yangqiao Road West, Fuzhou 350002, P. R. of China
,
Yu Du
a   College of Chemistry & Materials Science, Fujian Normal University, Fuzhou 350007, P. R. of China
b   State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, 155 Yangqiao Road West, Fuzhou 350002, P. R. of China
c   Fujian Science and Technology Innovation Laboratory for Optoelectronic Information of China, Fuzhou 350108, P. R. of China
,
Weiping Su
a   College of Chemistry & Materials Science, Fujian Normal University, Fuzhou 350007, P. R. of China
b   State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, 155 Yangqiao Road West, Fuzhou 350002, P. R. of China
c   Fujian Science and Technology Innovation Laboratory for Optoelectronic Information of China, Fuzhou 350108, P. R. of China
› Author Affiliations
This work was supported by the National Key Research and Development Program of China (2018YFA0704502), the National Natural Science Foundation of China (grant nos. 21871261, 21931011) and the Fujian Science and Technology Innovation Laboratory for Optoelectronic Information of China (2021ZZ105).


Abstract

The highly efficient synthesis of all-carbon tetrasubstituted olefins has been a challenge for decades, especially of multi-aryl-substituted olefins which are widely used in functional organic materials and pharmaceuticals. This work presents a carbonyl-directed palladium-catalyzed consecutive arylation of terminal alkenes with aryl iodides under mild conditions, in which a series of triarylated tetrasubstituted olefins were obtained in moderate yields. Because a weak chelation effect is generally difficult to support such a thorough trifold Heck arylation, and β-trans-selective alkenyl C–H activation cannot be achieved via a twisted endo-metallocyclic intermediate, the key to success is the compatibility between several mechanisms, including Heck reaction, C–H activation and E/Z-isomerization. Here, the judicious selection of a flexible-alkyl-chain-tethered carbonyl group seems to be critical, as it provides a proper chelation effect that not only assists distal alkenyl functionalization or isomerization, but also avoids byproducts caused by other possible β-H elimination or migration. The strategy developed herein greatly streamlines the preparation of the target molecules, and the protocol covers a range of readily available terminal alkenes bearing a native directing group (i.e., aldehyde, ketone and ester) and aryl iodides.

Supporting Information



Publication History

Received: 15 April 2024

Accepted after revision: 10 May 2024

Accepted Manuscript online:
10 May 2024

Article published online:
23 May 2024

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