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One Pot Access to 2'‐Aryl‐2,3'‐Bithiophenes via Twofold Palladium‐Catalyzed C‐X/C‐H Coupling Associated to a Pd‐1,4‐Migration

Abstract : The reactivity of 1,2-dihalobenzenes in palladium catalyzed polyheteroarylation via C-H bond functionalization was investigated. The first catalytic cycle using thiophene as the heteroarene gives the expected 2-(2-bromophenyl)thiophenes. In the course of the second catalytic cycle, in the presence of heteroarenes having a free C3-position, a partial Pd 1,4-migration occurred giving rise to aryl-substituted biheteroarenes such as 2'-aryl-2,3'-bithiophenes as well as the expected 1,2-di(thiophen-2-yl)benzenes. The best selectivities in favor of the formation of 2'-aryl-2,3'-bithiophenes were obtained with electron-rich 1,2-dihalobenzenes. A wide variety of thiophene derivatives bearing useful functions such as formyl, acetyl, cyclopropylmethanone, 2-methyl-1,3-dioxolane, ester, nitrile or chloro was tolerated allowing to prepare poly-functionalized 2'-aryl-2,3'-bithiophenes. Moreover, this one pot preparation of 2'-aryl-2,3'-bithiophenes employs a low loading of an air stable commercially available palladium source associated to an inexpensive base.
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https://hal-univ-rennes1.archives-ouvertes.fr/hal-03735527
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Submitted on : Tuesday, September 27, 2022 - 4:40:57 PM
Last modification on : Friday, September 30, 2022 - 11:38:40 AM

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Linhao Liu, Henri Doucet. One Pot Access to 2'‐Aryl‐2,3'‐Bithiophenes via Twofold Palladium‐Catalyzed C‐X/C‐H Coupling Associated to a Pd‐1,4‐Migration. Advanced Synthesis and Catalysis, Wiley-VCH Verlag, 2022, pp.2783-2795. ⟨10.1002/adsc.202200563⟩. ⟨hal-03735527⟩

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