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1
Enamines: Synthesis: Structure, and Reactions, Second Edition,
The tetrasubstituted isomer of the morpholine enamine of 2-methyl- cyclohexanone (98t) should be expected to exhibit a lower degree of enamine-type reactivity toward electrophilic agents than the trisub- stituted isomer (98r) because of the ...
2
Asymmetric Organocatalysis - 2권 - 31페이지
Benjamin List. O R 2 I S e R 1 N N R 1 R 2 R 2 R 2 N O N "Cl + " "F + " "Br+" "I + " R 10 R 8 R 9 R 5 Scheme 2 A range of transformations can be promoted by enamine catalysis 2 Catalytic Formation of Enamines 2.1 A Brief History of Enamine ...
3
Organic Mechanisms: Reactions, Stereochemistry and Synthesis
Somewhat more complicated is the synthesis of dimethylpyrrole D from acetonyl acetone (C) and ammonia. After the formation of the first imine, an imine ⇋ enamine isomerization oc- curs. A condensation followed by another imine Æ enamine ...
Reinhard Bruckner, Michael Harmata,
2010
4
Organic Reactions Stereochemistry And Mechanism (Through ...
G. STORK ENAMINE REACTION Enamines are good carbon nucleophiles which are used as the synthetic equivalent of ketone enolate unions. The stork enamine reaction is o/Ver the best method for alkylating or acylating ketories using a ...
5
Catalytic Asymmetric Conjugate Reactions - 194페이지
R′ H N EWG R′′ H anti-rotamer favored with X = H syn-rotamer favored with X = CH2R′ N EWG R′′ R′ anti-rotamer Re, Re attack syn-rotamer Si, Si attack Electronic interaction Activation of aldehyde by E-enamine formation EWG ...
6
Catalytic Cascade Reactions - 3페이지
1.2 enaMine-aCtivated CasCade ReaCtions We define the cascade reactions initiated by enamine catalysis in the initial step as an enamine-activated mode, although an iminium mode might be involved in the following steps. In this regard ...
Peng-Fei Xu, Wei Wang,
2013
7
Some Modern Methods of Organic Synthesis - 27페이지
I hydrolysis CH, R. RCH-C=O Enamine alkylation has a number of advantages over direct base-catalysed alkylation of aldehydes and ketones. Since no base or other catalyst is required, there is less tendency for wasteful self-condensation ...
8
Science of Synthesis: Stereoselective Synthesis Vol. 3: ... - 1021페이지
fiAldehydes, Æ-aryl, bicyclic, chiral, from enantioselective intramolecular Æ-arylation of aryl-tethered aldehydes, chiral enamine catalyzed 731–733 Aldehydes, aryl tethered, enantioselective intramolecular Æ-arylation, chiral enamine ...
Erick M. Carreira, Carl P. Decicco, P. Andrew Evans,
2014
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Organic Chemistry - 724페이지
Solution Prepare an enamine by treating the ketone with either morpholine or pyrrolidine. The intermediate aminoalcohol can undergo dehydration in two directions. The direction shown here is favored because of the stabilization gained by ...
William Brown, Christopher Foote, Brent Iverson,
2008
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Organic Reactions And Their Mechanisms - 211페이지
6.2 STORK ENAMINE REACTIONS (FORMATION OF CARBON- CARBON BONDS) • The name enamine usually refers to a, p-unsaturated amines. These can be prepared by reaction of an aldehyde or a ketone which contains atleast one ...