- Pd-Catalyzed Suzuki–Miyaura Cross-Coupling of Arylboronic Acids and α-Iminonitriles through C–CN Bond Activation
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A Pd-catalyzed Suzuki–Miyaura cross-coupling reaction between arylboronic acids and α-iminonitriles has been developed. The reaction proceeds through selective activation of the C–CN bond, tolerates a wide range of substituents, and delivers the versatile ketone products in moderate to excellent yields.
- Liu, Kui,Tao, Shou-Wei,Qian, Chun,Zhu, Yong-Ming
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supporting information
p. 4769 - 4775
(2018/09/06)
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- A phosphane-free, atom-efficient cross-coupling reaction of triarylbismuths with acyl chlorides catalyzed by MCM-41-immobilized palladium complex
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The first phosphane-free, heterogeneous, atom-efficient cross-coupling reaction of triarylbismuths and acyl chlorides was achieved in N-methylpyrrolidone (NMP) with Bu3N as the base at 80 °C in the presence of 1.5 mol-% MCM-41-immobilized bidentate nitrogen palladium complex [MCM-41-2N-Pd(OAc)2, MCM = mobile crystalline material] to yield a variety of unsymmetrical biaryl ketones in good to excellent yields. This heterogeneous palladium catalyst exhibited a high activity, which was similar to that of Pd(PPh3)4. The catalyst can be recovered by a simple filtration of the reaction solution and recycled in at least 10 consecutive trials without any decrease in activity. Our system not only avoids the use of phosphane ligands, but also solves the basic problem of palladium catalyst recovery and reuse. The first phosphane-free, heterogeneous, atom-efficient cross-coupling reaction of triarylbismuth compounds and acyl chlorides was achieved in N-methylpyrrolidone with Bu3N as the base at 80 °C in the presence of 1.5 mol-% MCM-41-immobilized bidentate nitrogen palladium complex [MCM-41-2N-Pd(OAc)2] to yield a variety of unsymmetrical biaryl ketones in good to excellent yields. Copyright
- Zhao, Hong,Yin, Lin,Cai, Mingzhong
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p. 1337 - 1345
(2013/04/10)
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- Ligand-free Pd-catalyzed carbonylative cross-coupling reactions under atmospheric pressure of carbon monoxide: Synthesis of aryl ketones and heteroaromatic ketones
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The carbonylative Suzuki cross-coupling reactions of boronic acids with aryl iodides catalyzed by Pd2(dba)3 as a ligand-free catalyst under atmospheric pressure of carbon monoxide has been firstly developed. Under mild reaction conditions, a broad range of aryl/heteroaryl iodides and aryl/heteroaryl boronic acids were selectively coupled to afford the corresponding diaryl ketones in good to excellent yields at low catalyst loadings (0.05 to 2 mol-%). Moreover, the catalyst can also be recycled. The carbonylative Suzuki cross-coupling reactions of boronic acids with aryl iodides catalyzed by Pd2(dba)3 as a ligand-free catalyst under an atmosphere of carbon monoxide has been developed. A broad range of aryl/heteroaryl iodides and aryl/heteroaryl boronic acids were selectively coupled to afford the corresponding diaryl ketones in good to excellent yields. The catalyst can also be recycled.
- Li, Hongling,Yang, Min,Qi, Yanxing,Xue, Jijun
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supporting information; experimental part
p. 2662 - 2667
(2011/06/25)
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- Deprotonative metalation of functionalized aromatics using mixed lithium-cadmium, lithium-indium, and lithium-zinc species
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In situ mixtures of CdCl2TMEDA (0.5 equiv; TMEDA = N,N,N',N'-tetramethylethylenediamine) or InCl3 (0.33 equiv) with [Li(tmp)] (tmp = 2,2,6,6-tetramethylpiperidino; 1.5 or 1.3 equiv, respectively) were compared with the previously described mixture of ZnCl2-TMEDA (0.5 equiv) and [Li(tmp)] (1.5 equiv) for their ability to deprotonate anisole, benzothiazole, and pyrimidine. [(tmp)3CdLi] proved to be the best base when used in tetrahydrofuran at room temperature, as demonstrated by subsequent trapping with iodine. The Cd-Li base then proved suitable for the metalation of a large range of aromatics including benzenes bearing reactive functional groups (CONEt2, CO2Me, CN, COPh) or heavy halogens (Br, I), and heterocycles (from the furan, thiophene, pyrrole, oxazole, thiazole, pyridine, and diazine series). Fivemembered heterocycles benefiting from doubly activated positions were similarly dideprotonated at room temperature. The aromatic lithium cadmates thus obtained were involved in palladium-catalyzed cross-coupling reactions or simply quenched with acid chlorides.
- Snegaroff, Katia,L'Helgoual'ch, Jean-Martial,Bentabed-Ababsa, Ghenia,Nguyen, Tan Tai,Chevallier, Floris,Yonehara, Mitsuhiro,Uchiyama, Masanobu,Derdour, Aicha,Mongin, Florence
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experimental part
p. 10280 - 10290
(2010/04/24)
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- Palladium-catalyzed chemoselective cross-coupling of acyl chlorides and organostannanes
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Chemoselective cross-coupling of aliphatic and aromatic acyl chlorides with aryl-, heteroaryl-, and alkynylstannanes proceeds in up to 98% yield using 2.5 mol % of bis(di-tert-butylchlorophosphine)palladium(II) dichloride as the precatalyst. Various functional groups including aryl chlorides and bromides that usually undergo oxidative addition to palladium complexes bearing phosphinous acid or dialkylchlorophosphine ligands are tolerated. This procedure allows convenient ketone formation and eliminates inherent limitations of Friedel-Crafts acylations such as substituent-directing effects and typical reactivity requirements of Lewis acid-catalyzed electrophilic aromatic substitutions.
- Lerebours, Rachel,Camacho-Soto, Alexandra,Wolf, Christian
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p. 8601 - 8604
(2007/10/03)
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- Infrared and Nuclear Magnetic Resonance Properties of Benzoyl Derivatives of Five-membered Monoheterocycles and Determination of Aromaticity Indices
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Benzophenones, 2-benzoylthiophenes, 2-benzoylpyrroles, and 2-benzoylfurans, which have substituents at m- and p-positions of the benzoyl ring were prepared and their ir and nmr spectra were obtained in 0.1 M chloroform-d solution. The chemical shift values of each series were plotted against the Hammett substituent parameters to give good correlation, with the exception of the ortho-Hs and -Cs. The slopes as well as the differences in chemical shift gave sets of meaningful values for the indices of aromaticy.
- Jeon, Kyu Ok,Jun, Jung Ho,Yu, Ji Sook,Lee, Chang Kiu
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p. 763 - 771
(2007/10/03)
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