Pyrido[1,2-a]pyrazine - Startprodukte für regioselektive Ringtransformationen und supramolekulare Architekturen / Pyrido[1,2-a]pyrazines - Starting Materials for Regioselective Ringtransformation Reactions and Supramolecular Architectures

2002 ◽  
Vol 57 (4) ◽  
pp. 471-478 ◽  
Author(s):  
D. Müller ◽  
B. Frank ◽  
R. Beckert ◽  
H. Görls
Keyword(s):  
Cycloaddition Reaction ◽  
Coupling Reaction ◽  
Cross Coupling ◽  
Building Blocks ◽  
Ring Transformation ◽  
Supramolecular Architectures ◽  
Cross Coupling Reaction ◽  
Metal Catalyzed

The easily available pyrido[1,2-a]pyrazines of type 1 are versatile building blocks for ring transformation reactions.W ith heterocyclic quinones such as quinoline-2,5,8-triones 4a-c, a highly regioselective [4+2]-cycloaddition reaction takes place in the first step, followed by a ring transformation cascade.T he 1,6-diazaanthracene-2,9,10-triones 5a-e, which possess an additional bipyridine substructure, could be isolated as main products.In order to modify the starting products of type 1, a metal-catalyzed cross-coupling reaction with acetylenic benzoic esters 9a,b has been performed.T he modified pyridopyrazines 10a,b which were obtained in good yields could be transformed by analogy to 1a,b into ring-fused heterocyclic quinones 12a,b.

scholarly journals Fluorinated Iron(ii) clathrochelate units in metalorganic based copolymers: improved porosity, iodine uptake, and dye adsorption properties

RSC Advances ◽  
2021 ◽  
Vol 11 (25) ◽  
pp. 14986-14995
Author(s):  
Suchetha Shetty ◽  
Noorullah Baig ◽  
Atikur Hassan ◽  
Saleh Al-Mousawi ◽  
Neeladri Das ◽  
...  
Keyword(s):  
Dye Adsorption ◽  
Coupling Reaction ◽  
Cross Coupling ◽  
Building Blocks ◽  
Adsorption Properties ◽  
Iodine Uptake ◽  
Cross Coupling Reaction ◽  
Palladium Catalyzed

We report the synthesis of metalorganic copolymers made from the palladium catalyzed Sonogashira cross-coupling reaction between various iron(ii) clathrochelate building blocks with diethynyl–triptycene and fluorene derivatives.

scholarly journals Recent Advancement of Ullmann Condensation Coupling Reaction in the Formation of Aryl-Oxygen (C-O) Bonding by Copper-Mediated Catalyst

Catalysts ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 1103
Author(s):  
Choong Jian Fui ◽  
Mohd Sani Sarjadi ◽  
Shaheen M. Sarkar ◽  
Md Lutfor Rahman
Keyword(s):  
Copper Catalyst ◽  
Low Cost ◽  
Coupling Reaction ◽  
Cross Coupling ◽  
Organometallic Reagents ◽  
Cross Coupling Reaction ◽  
Low Toxicity ◽  
Type C ◽  
Biaryl Ether ◽  
Metal Catalyzed

Transition metal-catalyzed chemical transformation of organic electrophiles and organometallic reagents belong to the most important cross coupling reaction in organic synthesis. The biaryl ether division is not only popular in natural products and synthetic pharmaceuticals but also widely found in many pesticides, polymers, and ligands. Copper catalyst has received great attention owing to the low toxicity and low cost. However, traditional Ullmann-type couplings suffer from limited substrate scopes and harsh reaction conditions. The introduction of homogeneous copper catalyst with presence of bidentate ligands over the past two decades has totally changed this situation as these ligands enable the reaction promoted in mild condition. The reaction scope has also been greatly expanded, rendering this copper-based cross-coupling attractive for both academia and industry. In this review, we will highlight the latest progress in the development of useful homogeneous copper catalyst with presence of ligand and heterogeneous copper catalyst in Ullmann type C-O cross-coupling reaction. Additionally, the application of Ullmann type C-O cross coupling reaction will be discussed.

Microwave-assisted synthesis of new fluorescent indoline-based building blocks by ligand free Suzuki-Miyaura cross-coupling reaction in aqueous media

Tetrahedron ◽  
2016 ◽  
Vol 72 (22) ◽  
pp. 2955-2963 ◽  
Author(s):  
Živilė Žukauskaitė ◽  
Vida Buinauskaitė ◽  
Joana Solovjova ◽  
Lina Malinauskaitė ◽  
Aistė Kveselytė ◽  
...  
Keyword(s):  
Aqueous Media ◽  
Coupling Reaction ◽  
Cross Coupling ◽  
Building Blocks ◽  
Microwave Assisted Synthesis ◽  
Microwave Assisted ◽  
Cross Coupling Reaction ◽  
Ligand Free

scholarly journals Metal Catalyzed Suzuki-Miyaura Cross-Coupling– Efficient Methodology for Synthesis the Natural and non-Natural biological active Molecules

2017 ◽  
Author(s):  
Hira Israr ◽  
Shazia Kaousar ◽  
Nasir Rasool ◽  
Gulraiz Ahmad ◽  
Muhammad Nazirul Mubin Aziz ◽  
...  
Keyword(s):  
Organic Chemistry ◽  
Transition Metal ◽  
Coupling Reaction ◽  
Cross Coupling ◽  
Biologically Active ◽  
Polymer Chemistry ◽  
Active Compounds ◽  
New Class ◽  
Cross Coupling Reaction ◽  
Metal Catalyzed

New class of biologically active and non-active compounds can be synthesized via transition metal mediated Suzuki cross coupling reaction that has a great impact on the advancement of organic chemistry. These resulted products can lend a helping hand in pharmaceutical and polymer chemistry for the betterment of mankind. Suzuki-Miyaura cross coupling reaction is one of the best tools through which many natural and non-natural compounds can be synthesized.

scholarly journals π-Conjugated Stannole Copolymers Synthesised by a Tin-Selective Stille Cross-Coupling Reaction

2021 ◽  
Author(s):  
Isabel-Maria Ramirez y Medina ◽  
Markus Rohdenburg ◽  
Pascal Rusch ◽  
Daniel Duvinage ◽  
Nadja C. Bigall ◽  
...  
Keyword(s):  
Conjugated Polymers ◽  
Main Chain ◽  
Coupling Reaction ◽  
Cross Coupling ◽  
Building Blocks ◽  
Cross Coupling Reaction

The synthesis of four well-defined conjugated polymers TStTT1-4 containing unusual heterocycle units in the main chain, namely stannole units as building blocks, is reported. The stannole-thiophenyl copolymers were generated by...

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