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In conjugate additions

Unsaturated chiral oxazolines have been employed in conjugate addition reactions... [Pg.240]

Sdi ir 6.1. Diactereocelectivity in conjugate addition of organociipratec to chiral o/clic enonec. [Pg.189]

Use of 3-trimethylsilylbut-3-en-2-one in conjugate addition/annelation reaction with 2-methylcyclohexenone after conjugate addition with lithium dimethylcopper. [Pg.76]

These ,(i-unsaLurated ketones and aldehydes are used as reactants in conjugate additions (Section 2.6), Robinson annulations (Section 2.1.4), and in a number of other reactions that we will encounter later. Entries 8 and 9 in Scheme 2.12 illustrate... [Pg.141]

Anions derived from nitriles can act as nucleophiles in conjugate addition reactions. A range of substituted phenylacetonitriles undergoes conjugate addition to 4-phenylbut-3-en-2-one. [Pg.189]

Control of Facial Selectivity in Conjugate Addition Reactions... [Pg.193]

As is the case for aldol addition, chiral auxiliaries and catalysts can be used to control stereoselectivity in conjugate addition reactions. Oxazolidinone chiral auxiliaries have been used in both the nucleophilic and electrophilic components under Lewis acid-catalyzed conditions. (V-Acyloxazolidinones can be converted to nucleophilic titanium enolates with TiCl3(0-/-Pr).320... [Pg.193]

Another type of mixed cyanocuprate has both methyl and alkenyl groups attached to copper. Interestingly, these reagents selectively transfer the alkenyl group in conjugate addition reactions.16 These reagents can be prepared from alkynes via hydrozirconation, followed by metal-metal exchange.17... [Pg.679]

Enantioselective Reactions of Organocopper Reagents. Several methods have been developed for achieving enantioselectivity with organocopper reagents. Chiral auxiliaries can be used for example, oxazolidinone auxiliaries have been utilized in conjugate additions. The outcome of these reactions can be predicted on the basis of steric control of reactant approach, as for other applications of the oxazolidinone auxiliaries. [Pg.702]

Figure 83 Examples of well-defined Cu-containing enantiopure complexes used in conjugate addition reactions with diethylzinc.82... Figure 83 Examples of well-defined Cu-containing enantiopure complexes used in conjugate addition reactions with diethylzinc.82...
Silyl esters of trivalent phosphorus acids have been used successfully in conjugate addition reactions using acrylates,393 395 nitriles,394 amides,396 397 ketones and aldehydes,398-404 and nitro compounds.387... [Pg.65]

Scheme 2.21 Regioselectivity in conjugate addition reactions to acceptor-substituted enynes 58. Scheme 2.21 Regioselectivity in conjugate addition reactions to acceptor-substituted enynes 58.
Scheme 3.11. Z Diastereoselectivities in conjugate additions of stannylcuprates to a,/ -unsaturated derivatives. Scheme 3.11. Z Diastereoselectivities in conjugate additions of stannylcuprates to a,/ -unsaturated derivatives.
See other pages where In conjugate additions is mentioned: [Pg.87]    [Pg.111]    [Pg.112]    [Pg.112]    [Pg.191]    [Pg.201]    [Pg.224]    [Pg.278]    [Pg.291]    [Pg.326]    [Pg.26]    [Pg.101]    [Pg.197]    [Pg.675]    [Pg.694]    [Pg.119]    [Pg.45]    [Pg.390]    [Pg.7]    [Pg.7]    [Pg.63]    [Pg.65]    [Pg.383]    [Pg.388]    [Pg.71]    [Pg.219]    [Pg.87]    [Pg.111]    [Pg.112]    [Pg.112]    [Pg.114]   
See also in sourсe #XX -- [ Pg.1029 ]

See also in sourсe #XX -- [ Pg.1106 , Pg.1109 ]



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Acyclic Diastereoselection in Conjugate Additions

Cuprates, in conjugate addition

Esters in conjugate addition reactions

Facial Selectivity in Conjugate Addition Reactions

Hydrogen-bonding additives in conjugated dienes

Hydrogen-bonding additives in conjugated trienes

In the conjugate addition

Silyl enol ethers in conjugate additions

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