ChemInform Abstract: 1,2,4-Triazines in Organic Synthesis. Part 17. Tandem Vicarious Nucleophilic Substitution of Hydrogen/Intramolecular Diels-Alder Reaction of 1,2,4-Triazines into Functionalized Cycloalkenopyridines.

ChemInform ◽  
2010 ◽  
Vol 33 (39) ◽  
pp. no-no
Author(s):  
Danuta Branowska ◽  
Stanislaw Ostrowski ◽  
Andrzej Rykowski
Keyword(s):  
Nucleophilic Substitution ◽  
Organic Synthesis ◽  
Alder Reaction ◽  
Diels Alder ◽  
Nucleophilic Substitution Of Hydrogen ◽  
Vicarious Nucleophilic Substitution ◽  
Diels Alder Reaction

Enantioselective Syntheses of Flavonoid Diels-Alder Natural Products: A Review

2018 ◽  
Vol 15 (2) ◽  
pp. 221-229 ◽  
Author(s):  
Shah Bakhtiar Nasir ◽  
Noorsaadah Abd Rahman ◽  
Chin Fei Chee
Keyword(s):  
Natural Products ◽  
Organic Synthesis ◽  
Lewis Acid ◽  
Alder Reaction ◽  
Diels Alder ◽  
Enantioselective Synthesis ◽  
Chiral Ligand ◽  
Asymmetric Syntheses ◽  
Diels Alder Reaction ◽  
Enantioselective Syntheses

Background: The Diels-Alder reaction has been widely utilised in the syntheses of biologically important natural products over the years and continues to greatly impact modern synthetic methodology. Recent discovery of chiral organocatalysts, auxiliaries and ligands in organic synthesis has paved the way for their application in Diels-Alder chemistry with the goal to improve efficiency as well as stereochemistry. Objective: The review focuses on asymmetric syntheses of flavonoid Diels-Alder natural products that utilize chiral ligand-Lewis acid complexes through various illustrative examples. Conclusion: It is clear from the review that a significant amount of research has been done investigating various types of catalysts and chiral ligand-Lewis acid complexes for the enantioselective synthesis of flavonoid Diels-Alder natural products. The results have demonstrated improved yield and enantioselectivity. Much emphasis has been placed on the synthesis but important mechanistic work aimed at understanding the enantioselectivity has also been discussed.

Facile access to novel chromeno-2,6,9-trioxabicyclo[3.3.1]nonadienes via tandem nucleophilic substitution and [4+2] hetero Diels–Alder reaction: experimental and theoretical study

Tetrahedron ◽  
2013 ◽  
Vol 69 (9) ◽  
pp. 2142-2149 ◽  
Author(s):  
Satyanarayana Reddy Jaggavarapu ◽  
Anand Solomon Kamalakaran ◽  
Gaddamanugu Gayatri ◽  
Matsyendranath Shukla ◽  
Kavita Dorai ◽  
...  
Keyword(s):  
Nucleophilic Substitution ◽  
Theoretical Study ◽  
Alder Reaction ◽  
Diels Alder ◽  
Diels Alder Reaction
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