An efficient phosphine-free direct C–Harylation of thiophenes at the α-position has been developed at low catalyst loading of bis(alkoxo)palladium complex (Cat.I, 0.1–0.2 mol %). The developed synthetic method can be applied to the synthesis of α-aryl/heteroaryl thiophenes from aryl or heteroaryl bromides in good to excellent yields and is compatible with the substrates bearing electron-donating or
Solvent-Free Palladium-Catalyzed Direct Arylation of Heteroaromatics with Aryl Bromides
作者:Souhila Bensaid、Henri Doucet
DOI:10.1002/cssc.201100771
日期:2012.8
course of catalyzed directarylations. Some palladium‐catalyzed directarylations of heteroaromatics can be advantageously performed without any solvent. In the presence of palladiumcatalysts (1 mol %) and potassium acetate as the base, the direct 5‐arylation of some thiazoles, thiophenes, furans, or pyrroles with arylbromides as coupling partners proceeds highly regioselectively and in moderate to
Generation of metalated thiophenes with Grignard reagent and catalytic secondary amine for the cross coupling reaction with aryl halides
作者:Shota Tanaka、Daiki Tanaka、Atsushi Sugie、Atsunori Mori
DOI:10.1016/j.tetlet.2011.12.108
日期:2012.2
The reaction of thiophene derivatives with Grignard reagent (EtMgCl) and a catalytic amount of amine (Cy2NH) induced the metalation at the α-position. Following addition of several aryl halides in the presence of a nickel or palladium catalyst afforded C–H arylated products in good to excellent yields. The method was successfully applied to facile synthesis of differently-substituted 2,5-diarylthiophenes
Highly electron-poor Buchwald-type ligand: application for Pd-catalysed direct arylation of thiophene derivatives and theoretical consideration of the secondary Pd<sup>0</sup>–arene interaction
作者:Toshinobu Korenaga、Ryo Sasaki、Kazuaki Shimada
DOI:10.1039/c5dt01991e
日期:——
Highly electron-poor SPhos ligands stabilised the Pd complex by secondary Pd0–arene interaction.
高度电子贫化的SPhos配体通过次要的Pd0-芳烃相互作用稳定了Pd配合物。
Derivative having ppar agonistic activity
申请人:Itai Akiko
公开号:US20090286974A1
公开(公告)日:2009-11-19
A compound of the formula (I):
a pharmaceutically acceptable salt or solvate thereof,
wherein
Ring Q is optionally substituted monocyclic aryl, optionally substituted monocyclic heteroaryl, optionally substituted fused aryl or optionally substituted fused heteroaryl,
Y
1
is a bond or —NR
6
— or the like,
Ring A is optionally substituted nonaromatic heterocyclediyl,
a group of the formula: -Y
2
Z
1
- is a group of the formula:
R
7
are each independently hydrogen, optionally substituted lower alkyl or the like,
R
8
and R
9
are each independently hydrogen or optionally substituted lower alkyl,
n is an integer between 1 and 3,
Z
1
is a bond, —O—, —S— or —NR
9
—,
Ring B is optionally substituted aromatic carbocyclediyl or optionally substituted aromatic heterocyclediyl,
Y
3
is a bond, optionally substituted lower alkylene optionally intervened by —O—, optionally substituted lower alkenylene or the like, and
Z
2
is COOR
3
or the like.