Oxidant- and hydrogen acceptor-free palladium catalyzed dehydrogenative cyclization of acylhydrazones to substituted oxadiazoles

2018 ◽  
Vol 5 (3) ◽  
pp. 386-390 ◽  
Author(s):  
Qiangqiang Jiang ◽  
Xinghui Qi ◽  
Chenyang Zhang ◽  
Xuan Ji ◽  
Jin Li ◽  
...  
Keyword(s):  
Efficient Method ◽  
Hydrogen Acceptor ◽  
Palladium Catalyzed

An efficient method for the synthesis of 2,5-disubstituted 1,3,4-oxadiazoles has been developed through palladium(0) catalyzed dehydrogenative cyclization ofN-arylidenearoylhydrazides without oxidants and hydrogen acceptors.

ChemInform Abstract: An Efficient Method for the Preparation of Tertiary Esters by Palladium-Catalyzed Alkoxycarbonylation of Aryl Bromides.

ChemInform ◽  
2012 ◽  
Vol 43 (19) ◽  
pp. no-no
Author(s):  
Zhuo Xin ◽  
Thomas M. Goegsig ◽  
Anders T. Lindhardt ◽  
Troels Skrydstrup
Keyword(s):  
Efficient Method ◽  
Aryl Bromides ◽  
Palladium Catalyzed

Diversity-Oriented Synthesis of Substituted Furo[2,3-b]pyrazines

2009 ◽  
Vol 62 (1) ◽  
pp. 27 ◽  
Author(s):  
Vaibhav P. Mehta ◽  
Sachin G. Modha ◽  
Denis Ermolat'ev ◽  
Kristof Van Hecke ◽  
Luc Van Meervelt ◽  
...  
Keyword(s):  
Efficient Method ◽  
Electrophilic Cyclization ◽  
Diversity Oriented Synthesis ◽  
Highly Efficient ◽  
Palladium Catalyzed ◽  
Catalyzed Reactions

A highly efficient method for the synthesis of diversely substituted furo[2,3-b]pyrazines has been elaborated. The Ag+- or iodine-mediated electrophilic cyclization of readily generated 5-chloro-3-substituted ethynyl-1-(4-methoxybenzyl)-pyrazin-2(1H)-ones affords substituted furo[2,3-b]pyrazines, which undergo various palladium catalyzed reactions to generate a library of difficult to attain diversely substituted furo[2,3-b]pyrazines.

Microwave-assisted palladium mediated efficient synthesis of pyrazolo[3,4-b]pyridines, pyrazolo[3,4-b]quinolines, pyrazolo[1,5-a]pyrimidines and pyrazolo[1,5-a]quinazolines

RSC Advances ◽  
2014 ◽  
Vol 4 (46) ◽  
pp. 24001-24006 ◽  
Author(s):  
Kommuri Shekarrao ◽  
Partha Pratim Kaishap ◽  
Venkateshwarlu Saddanapu ◽  
Anthony Addlagatta ◽  
Sanjib Gogoi ◽  
...  
Keyword(s):  
Microwave Irradiation ◽  
Efficient Method ◽  
Solvent Free ◽  
Efficient Synthesis ◽  
Aryl Aldehydes ◽  
Microwave Assisted ◽  
Fused Heterocycles ◽  
Palladium Catalyzed ◽  
Solvent Free Reaction

An efficient method was developed for the synthesis of pyrazole fused heterocycles via the palladium-catalyzed solvent free reaction of β-halovinyl/aryl aldehydes and 3-aminopyrazoles/5-aminopyrazoles under microwave irradiation in good yields.

Synthesis of 1H-indole-3-sulfonates via palladium-catalyzed tandem reactions of 2-alkynyl arylazides with sulfonic acids

2017 ◽  
Vol 15 (29) ◽  
pp. 6080-6083 ◽  
Author(s):  
Xiaoxiang Zhang ◽  
Ping Li ◽  
Chang Lyu ◽  
Wanxiong Yong ◽  
Jing Li ◽  
...  
Keyword(s):  
Efficient Method ◽  
Tandem Reactions ◽  
Sulfonic Acids ◽  
Palladium Catalyzed

An efficient method for the synthesis of 1H-indole-3-sulfonates via palladium-catalyzed tandem reactions of 2-alkynyl arylazides with sulfonic acids has been developed.

Sonogashira coupling reactions: Synthesis of 4-substituted-6-methyl-2-(methylthio)pyrimidines catalyzed by Pd–Cu

2019 ◽  
Vol 43 (9-10) ◽  
pp. 431-436
Author(s):  
Fatemeh Rezaeimanesh ◽  
Mohammad Bakherad ◽  
Hossein Nasr-Isfahani
Keyword(s):  
Efficient Method ◽  
Room Temperature ◽  
Reaction Times ◽  
Coupling Reactions ◽  
Sonogashira Coupling ◽  
Aryl Iodides ◽  
Palladium Catalyzed ◽  
Sonogashira Reactions

An efficient method is developed for the synthesis of 4-(3-arylprop-2-ynyloxy)-6-methyl-2-(methylthio)pyrimidines via palladium-catalyzed Sonogashira reactions of 4-methyl-2-(methylthio)-6-(prop-2-yn-1-yloxy)pyrimidine with electron-poor aryl iodides in acetonitrile at room temperature. Excellent yields of the products were obtained in reaction times of 9–11 h.

Palladium-Catalyzed Cross-Coupling of 1,3,4-Oxadiazoles and Styrenes: An Efficient Method to Synthesize 2-Alkenyl-1,3,4- Oxadiazoles§

Synlett ◽  
2017 ◽  
Vol 29 (01) ◽  
pp. 71-74 ◽  
Author(s):  
N. Salvanna ◽  
Biswanath Das ◽  
P. Reddy
Keyword(s):  
Efficient Method ◽  
Cross Coupling ◽  
Silver Trifluoroacetate ◽  
Palladium Catalyzed ◽  
Oxadiazole Derivatives ◽  
High Yields

2-Alkenyl-1,3,4-oxadiazole derivatives have been prepared by cross-coupling of 1,3,4-oxadiazoles with styrenes by using palladium(II) trifluoroacetate [Pd(TFA)2] as a catalyst, 1,10-phenanthroline as a ligand, silver trifluoroacetate as an oxidant, and toluene as a solvent. The products were formed in high yields and no byproducts were detected.

scholarly journals Palladium-Catalyzed Direct Mono- and Diarylation of Diphenydithienylethenes: A Useful Method for Enhancing Fluorescence Intensity and Aggregation-Induced Emission

Molbank ◽  
10.3390/m1210 ◽  
2021 ◽  
Vol 2021 (2) ◽  
pp. M1210
Author(s):  
Thanh Thanh Le ◽  
Son Thai Phan ◽  
Hai Thi Hong Le ◽  
Hien Nguyen ◽  
Tung Thanh Dang ◽  
...  
Keyword(s):  
Organic Solvents ◽  
Fluorescence Intensity ◽  
Efficient Method ◽  
Luminescent Properties ◽  
Aggregation Induced Emission ◽  
Palladium Catalyzed

In this study we report efficient method for the syntheses of mono- and diarylated diphenyldithienylethene (DPDTE) via a palladium-catalyzed C–H arylation reaction. These new derivatives showed amplified luminescent properties thanks to a change in polarity, particularly in the presence of an electron-withdrawing groups (EWG). Moreover, the arylated DPDTEs showed dual-emissive phenomena, including fluorescence in organic solvents and aggregation-induced emission.

Palladium-catalyzed dehydrogenation of dihydro-heterocycles using isoprene as the hydrogen acceptor without oxidants

2017 ◽  
Vol 7 (3) ◽  
pp. 565-569 ◽  
Author(s):  
Xiao-Jun Liu ◽  
Wen-Peng Wang ◽  
Cong-De Huo ◽  
Xi-Cun Wang ◽  
Zheng-Jun Quan
Keyword(s):  
Hydrogen Acceptor ◽  
Palladium Catalyzed ◽  
General Method ◽  
Heteroatom Compounds

An efficient and general method for Pd-catalyzed dehydrogenative aromatization of dihydro-heteroatom compounds without external O2 and H2 is first described.

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