Fast construction of dianthraceno[a,e]pentalenes for OPV applications

2017 ◽  
Vol 4 (5) ◽  
pp. 711-716 ◽  
Author(s):  
Zhongbo Zhang ◽  
Haijun Fan ◽  
Xiaozhang Zhu

A new method based on a palladium-catalyzed tandem reaction for the fast construction of a dianthraceno[a,e]pentalene (DAP) framework is developed, which gave a series of dianthraceno[a,e]pentalenes with good functional group tolerance, and it should be highlighted that five C–C bonds were formed in one reaction.

2020 ◽  
Author(s):  
Baojian Xiong ◽  
Yue Li ◽  
Yin Wei ◽  
Søren Kramer ◽  
Zhong Lian

Cross-coupling between substrates that can be easily derived from phenols is highly attractive due to the abundance and low cost of phenols. Here, we report a dual nickel/palladium-catalyzed reductive cross-coupling between aryl tosylates and aryl triflates; both substrates can be accessed in just one step from readily available phenols. The reaction has a broad functional group tolerance and substrate scope (>60 examples). Furthermore, it displays low sensitivity to steric effects demonstrated by the synthesis of a 2,2’disubstituted biaryl and a fully substituted aryl product. The widespread presence of phenols in natural products and pharmaceuticals allow for straightforward late-stage functionalization, illustrated with examples such as Ezetimibe and tyrosine. NMR spectroscopy and DFT calculations indicate that the nickel catalyst is responsible for activating the aryl triflate, while the palladium catalyst preferentially reacts with the aryl tosylate.


2019 ◽  
Author(s):  
John Montgomery ◽  
Alexander W. Rand

A new method to access alpha-arylated benzamides has been enabled by metallaphotoredox catalysis. This system allows for non-directed C–H functionalization of N-alkyl benzamides using a dual nickel/iridium catalytic system to form tertiary stereocenters in good enantiomeric excess and moderate yields. This reaction shows excellent functional group compatibility and can be performed using a number of sterically and electronically different aryl bromides and secondary benzamides.


2019 ◽  
Author(s):  
John Montgomery ◽  
Alexander W. Rand

A new method to access alpha-arylated benzamides has been enabled by metallaphotoredox catalysis. This system allows for non-directed C–H functionalization of N-alkyl benzamides using a dual nickel/iridium catalytic system to form tertiary stereocenters in good enantiomeric excess and moderate yields. This reaction shows excellent functional group compatibility and can be performed using a number of sterically and electronically different aryl bromides and secondary benzamides.


2012 ◽  
Vol 134 (50) ◽  
pp. 20433-20439 ◽  
Author(s):  
Yoshinori Yamanoi ◽  
Junya Sendo ◽  
Tetsuhiro Kobayashi ◽  
Hiroaki Maeda ◽  
Yusuke Yabusaki ◽  
...  

2016 ◽  
Vol 3 (9) ◽  
pp. 1096-1099 ◽  
Author(s):  
Huanhuan Liu ◽  
Tianran Zhai ◽  
Shiteng Ding ◽  
Yalei Hou ◽  
Xiangyu Zhang ◽  
...  

New method for synthesis of 2-hetarylquinazolin-4(3H)-ones from 2-aminobenzamides and (2-azaaryl)methanes under transition-metal free conditions, featuring a wide substrate scope with a broad range of functional group tolerance under mild conditions.


ChemInform ◽  
2007 ◽  
Vol 38 (52) ◽  
Author(s):  
Hai-Peng Bi ◽  
Xue-Yuan Liu ◽  
Fa-Rong Gou ◽  
Li-Na Guo ◽  
Xin-Hua Duan ◽  
...  

Synthesis ◽  
2020 ◽  
Author(s):  
Dongping Cheng ◽  
Xiaoliang Xu ◽  
Yueqi Pu ◽  
Mingliang Wang ◽  
Yinqiang Shen ◽  
...  

AbstractA DDQ-mediated tandem reaction of easily available o-hydroxy­aryl enaminones and cycloheptatriene is disclosed. It provides an effective and convenient method for the synthesis of 3-(cycloheptatrienyl)-substituted chromones in moderate to excellent yields with good functional group tolerance; this reaction involves an oxidative coupling and intramolecular annulation pathway.


2019 ◽  
Vol 55 (26) ◽  
pp. 3769-3772 ◽  
Author(s):  
Ying Zhang ◽  
Hong-Cheng Shen ◽  
Yang-Yang Li ◽  
Yong-Shuang Huang ◽  
Zhi-Yong Han ◽  
...  

A palladium-catalyzed enantioselective tandem reaction of 2,5-cyclohexadienyl-substituted aryl iodides and carbon or heteroatom nucleophiles has been successfully established by using a chiral H8-BINOL-based phosphoramidite ligand.


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