Palladium-catalysed cross-coupling of 2-trimethylsilylpyridine with aryl halides in the presence of stoichiometric silver(I) oxide, and catalytic TBAF allows the rapid preparation of the corresponding pyridin-2-ylaryl compounds in moderate to good yields under mild thermal conditions.
Benzimidazolin-2-ylidene–palladium-catalysed coupling reactions of aryl halides
✍ Scribed by Yetkin Gök; Nevin Gürbüz; İsmail Özdemir; Bekir Çetinkaya; Engin Çetinkaya
- Publisher
- John Wiley and Sons
- Year
- 2005
- Tongue
- English
- Weight
- 116 KB
- Volume
- 19
- Category
- Article
- ISSN
- 0268-2605
- DOI
- 10.1002/aoc.922
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✦ Synopsis
The in situ prepared three-component system Pd(OAc) 2 -1,3-dialkylbenzimidazolium chlorides (2a-f) and Cs 2 CO 3 catalyses, quantitatively, the Suzuki cross-coupling of deactivated aryl chlorides and Heck coupling reactions of aryl bromide and iodide substrates. The 1,3-dialkylbenzimidazolium salts (2a-f) were characterized by conventional spectroscopic methods and elemental analysis.
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## Indole derivatives R 0140 Palladium-Catalyzed Cross-Coupling Reactions of 2-Indolyldimethylsilanols with Substituted Aryl Halides. -A mild and general protocol for the title reaction is developed affording the cross-coupling products in good yields. The reactivity of the 2-indolyl moiety toward
## Abstract For Abstract see ChemInform Abstract in Full Text.
## Abstract Symmetrically and unsymmetrically substituted benzimidazolium bromides (1a–d = NHC·HBr) were synthesized, incorporating bulky benzyl and/or methoxyethyl substituents (a: R = pentamethylbenzyl, R′ = 2‐methoxyethyl; b: R = 2,3,5,6‐tetramethylbenzyl, R′ = methoxyethyl; c: R, R′ = pentameth