A series of unsymmetrically substituted biphenyl compounds was designed as alpha helical proteomimetics with the aim of inhibiting the binding of coactivator proteins to the nuclear hormone receptor coactivator binding domain. These compounds were synthesized in good overall yields in seven steps starting from 2-bromoanisole. The final products were evaluated using cotransfection reporter gene assays and mammalian two-hybrid competitive inhibition assays to demonstrate their effectiveness as competitive binding inhibitors. The results from this study indicate that these proteomimetics possess the ability to inhibit coactivator-receptor interactions, but via a mixed mode of inhibition. (C) 2013 Elsevier Ltd. All rights reserved.
A series of unsymmetrically substituted biphenyl compounds was designed as alpha helical proteomimetics with the aim of inhibiting the binding of coactivator proteins to the nuclear hormone receptor coactivator binding domain. These compounds were synthesized in good overall yields in seven steps starting from 2-bromoanisole. The final products were evaluated using cotransfection reporter gene assays and mammalian two-hybrid competitive inhibition assays to demonstrate their effectiveness as competitive binding inhibitors. The results from this study indicate that these proteomimetics possess the ability to inhibit coactivator-receptor interactions, but via a mixed mode of inhibition. (C) 2013 Elsevier Ltd. All rights reserved.
Addition reaction of arylboronic acids to aldehydes and α,β-unsaturated carbonyl compounds catalyzed by conventional palladium complexes in the presence of chloroform
作者:Tetsuya Yamamoto、Michiko Iizuka、Hiroto Takenaka、Tetsuo Ohta、Yoshihiko Ito
DOI:10.1016/j.jorganchem.2008.12.032
日期:2009.4
Arylboronic acids react with aldehydes and α,β-unsaturatedcarbonylcompounds in the presence of a base and a catalytic amount of a palladium(0) complex with chloroform, affording the corresponding addition products in good yields, and chiral benzhydrol was obtained with up to 43% e.e. using (S,S)-bppm as a ligand. General palladium complexes have no catalytic activity without chloroform. Because chloroform
Introducing Water and Deep Eutectic Solvents in Organosodium Chemistry: Chemoselective Nucleophilic Functionalizations in Air
作者:Giuseppe Dilauro、Cosimo Luccarelli、Andrea F. Quivelli、Paola Vitale、Filippo M. Perna、Vito Capriati
DOI:10.1002/anie.202304720
日期:2023.7.24
Organosodiumcompounds, generated by the oxidative addition of a C−Cl bond to Na, a halogen/Na exchange, or by direct sodiation using Na bricks or neopentylsodium in hexane, have been intercepted by various electrophiles, when working “on water” or in eutectic mixtures. These reactions display a broad substrate scope, under hydrous conditions at room temperature, short reaction times (20 s), high chemoselectivity
有机钠化合物是通过 C−Cl 键与 Na 的氧化加成、卤素/Na 交换或通过在己烷中使用钠砖或新戊基钠直接钠化而生成的,在“对水”或在水中工作时,已被各种亲电子试剂拦截。低共熔混合物。这些反应显示出广泛的底物范围,在室温含水条件下,反应时间短(20秒),化学选择性高,并且它们也是可扩展的。
Efficient 1,2-Addition of Aryl- and Alkenylboronic Acids to Aldehydes Catalyzed by the Palladium/Thioether−Imidazolinium Chloride System
[GRAPHICS]The high level of catalyst performance was attainable in the palladium-catalyzed 1,2-addition of aryl-, heteroaryl-, and alkenylboronic acids to aromatic, heteroaromatic, and aliphatic aldehydes using thioether-imidazolinium chloride L5 as a heterobidentate carbene ligand precursor.
Palladium-catalyzed arylation of aldehydes with bromo-substituted 1,3-diaryl-imidazoline carbene ligand
The combination of 0 valent palladium precursor and bromo-substituted 1,3-diaryl-imidazoline carbene ligand precursor such as 1-(2-bromophenyl)-3-(2,6-diisopropylphenyl)-imidazolinium chloride 1a exhibited high catalytic activity for the 1,2-addition of arylboronic acids to aldehydes including aqueous formaldehyde. (C) 2014 Elsevier Ltd. All rights reserved.
Palladium-Catalyzed Addition of Arylboronic Acids to Aldehydes
作者:Tetsuya Yamamoto、Tetsuo Ohta、Yoshihiko Ito
DOI:10.1021/ol051501y
日期:2005.9.1
Arylboronic acids react with aldehydes in the presence of a base and a catalytic amount of a palladium(0) complex with chloroform, affording the corresponding secondary alcohols in good yields. General palladium complexes have no catalytic activity without chloroform. Chloroform is essential for this reaction, and palladium complex that was prepared from Pd(PPh3)(4) with CHCl3 showed good catalytic acitivty as well.