scholarly journals An ortho-quinone methide based strategy towards the rubromycin spiroketal family

RSC Advances ◽  
2015 ◽  
Vol 5 (98) ◽  
pp. 80212-80215 ◽  
Author(s):  
N. J. Willis ◽  
C. D. Bray
Keyword(s):  
Diels Alder ◽  
Quinone Methide

A method for the generation/in situhetero-Diels–Alder cycloaddition of a trisubstitutedortho-quinone methide (o-QM) is described.

Asymmetric Synthesis of Fused Tetrahydroquinolines via Intramolecular Aza-Diels-Alder Reaction of ortho-Quinone Methide Imines

Synthesis ◽  
2021 ◽  
Author(s):  
Fabian Hofmann ◽  
Cornelius Gärtner ◽  
Martin Kretzschmar ◽  
Christoph Schneider
Keyword(s):  
Asymmetric Synthesis ◽  
Alder Reaction ◽  
Single Step ◽  
Diels Alder ◽  
Quinone Methide ◽  
Bronsted Acid ◽  
Atom Economy ◽  
Diels Alder Reaction ◽  
Brönsted Acid ◽  
Chiral Bronsted Acid

Aza-Diels Alder reactions are straightforward processes in the construction of N-heterocycles, featuring inherent atom-economy and stereospecificity. Intramolecular strategies allow formation of bicyclic core structures with up to three stereocenters within a single step. Herein, this concept is combined with the chemistry of chiral Brønsted acid-bound ortho-quinone methide imines generating a range of interesting fused tetrahydro-quinolines in a diastereo- and enantioselective manner.

One-Pot Synthesis of ABC Type Triblock Copolymers via in situ Click [3 + 2] and Diels−Alder [4 + 2] Reactions

2007 ◽  
Vol 40 (2) ◽  
pp. 191-198 ◽  
Author(s):  
Hakan Durmaz ◽  
Aydan Dag ◽  
Ozcan Altintas ◽  
Tuba Erdogan ◽  
Gurkan Hizal ◽  
...  
Keyword(s):  
Triblock Copolymers ◽  
Diels Alder ◽  
One Pot ◽  
One Pot Synthesis

scholarly journals Synthesis of nanodiamond derivatives carrying amino functions and quantification by a modified Kaiser test

2014 ◽  
Vol 10 ◽  
pp. 2729-2737 ◽  
Author(s):  
Gerald Jarre ◽  
Steffen Heyer ◽  
Elisabeth Memmel ◽  
Thomas Meinhardt ◽  
Anke Krueger
Keyword(s):  
Diels Alder ◽  
Amino Groups ◽  
Pyrimidine Derivatives ◽  
Quantification Method ◽  
Different Types ◽  
Primary Amino ◽  
Wet Chemical ◽  
Terminal Amino ◽  
Chemical Quantification

Nanodiamonds functionalized with different organic moieties carrying terminal amino groups have been synthesized. These include conjugates generated by Diels–Alder reactions of ortho-quinodimethanes formed in situ from pyrazine and 5,6-dihydrocyclobuta[d]pyrimidine derivatives. For the quantification of primary amino groups a modified photometric assay based on the Kaiser test has been developed and validated for different types of aminated nanodiamond. The results correspond well to values obtained by thermogravimetry. The method represents an alternative wet-chemical quantification method in cases where other techniques like elemental analysis fail due to unfavourable combustion behaviour of the analyte or other impediments.

scholarly journals Nanocrystals perovskites photocatalyzed singlet oxygen generation for light-driven organic reactions

2021 ◽  
Author(s):  
Marco Corti ◽  
Rossella Chiara ◽  
Lidia Romani ◽  
Barbara Mannucci ◽  
Lorenzo Malavasi ◽  
...  
Keyword(s):  
Diels Alder ◽  
Organic Reactions ◽  
Hydroxy Ketone ◽  
Oxidation Reactions ◽  
Perovskite Nanocrystals ◽  
Oxygen Generation ◽  
Unsaturated Ketones ◽  
Halide Perovskite ◽  
Lead Halide

AbstractLead halide perovskite nanocrystals were prepared and used as photocatalysts for the in situ 1O2 generation to perform hetero Diels–Alder, ene and oxidation reactions with suitable dienes and alkenes. The methodology has been reasonably standardized and made applicable to a variety of olefinic substrates. The scope of the method is finely illustrated by the results in all the tested reactions, which allowed to obtain desymmetrized hydroxy-ketone derivatives, unsaturated ketones and epoxides. Some limitations were also observed especially in the case of the alkene oxidations as well as poor chemoselectivity was somewhere observed. Graphic abstract 1O2 generated by lead halide perovskite nanocrystals as photocatalyst in organic reactions.

Organocatalytic enantioselective Diels–Alder reaction between hydroxymaleimides and in situ generated nitrosoalkenes for direct preparation of chiral hemiketals with 1,2-oxazine skeleton

2021 ◽  
Author(s):  
Min Xiang ◽  
Chen-Yi Li ◽  
Jian Zhang ◽  
Ying Zou ◽  
Wen-Sheng Li ◽  
...  
Keyword(s):  
Alder Reaction ◽  
Diels Alder ◽  
Diels Alder Reaction ◽  
Direct Preparation

Organocatalytic Enantioselective IEDDA reaction between hydroxymaleimides and in situ generated nitrosoalkenes has been disclosed, a series of chiral hemiketals containing 5,6-dihydro-4H-l,2-oxazines and succinimide frameworks have been prepared.

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