Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Asymmetric aldehydes

I.4.2.6. 1-Deuterio Aldehydes Asymmetric hydrogenation of 1-deuterio benzaldehydes with Ru(OCOCH3)2[(5)-binap] in the presence of 5 equiv. of HC1 gives the corresponding chiral 1-deuterio alcohols with up to 89% ee (Scheme 1.75) [280]. The heteroatom substitution at the C2 position in the benzene ring tends to increase the enantioselectivity due to the heteroa-tom/metal interaction. This catalyst is less reactive in deuteration of benzaldehyde. [Pg.69]

Miscellaneous. There are several other reports on the application of this ligand to catalytic asymmetric reactions, although enantioselectivities are modest. Those reports include the Mukaiyama-Michael reaction, allylation of aldehydes, asymmetric Diels-Alder reaction, Mukaiyama-Aldol reaction of ketomalonate, aziridination reaction of a-imino esters, and asymmetric hetero-Diels-Alder reaction. ... [Pg.127]

Substituted (2/J,3/J)-ethyl azmdine-2-carboxylates are synthesized from imines and ethyl diazoacetate. The catalyst system is composed from (PhOlsB and (Sl-VAPOL." Asymmetric cyclopropanation of electron-deficient aUcenes can be carried out with a Co(II) porphyrinate in which chiral substituents are set in two disjunct mero-positions. The presence of 129 or 130 renders the Corey-Chaykovsky method for cyclopiopana-tion of conjugated aldehydes asymmetric. Thus it is easy to access (15,2/J)-2-formylcyclo-propyl ketones from enals and acymethylsulfonium ylides. ... [Pg.136]

Brandau S, Landa A, Franzen J, Marigo M, Jprgensen KA (2006) Organocatalytic Conjugate Addition of Malonates to a,(3-Unsaturated Aldehydes Asymmetric Formal Synthesis of (-)-Paroxetine, Chiral Lactams, and Lactones. Angew Chem Int Ed 45 4305... [Pg.224]

Keywords Indoles, aromatic amines, oxetanyl aldehydes, asymmetric catalyst A, diethyl ether, room temperature, asymmetric multicomponent reaction, aza-Diels-Alder reaction, indole-alkaloid-type polycycles, diastereoseltivity... [Pg.151]

Most known chiral secondary-amine catalysts are effective only for less sterically hindered substrates such as a,p-unsaturated aldehydes. Asymmetric Diels-Alder reactions of acyclic a,p-unsaturated ketones represent a formidable challenge in this area. In 2002, MacMillan and coworkers accomplished the first general enanti-oselective Diels-Alder reactions of ketones by using chiral amine 26 [16]. As shown... [Pg.1136]


See other pages where Asymmetric aldehydes is mentioned: [Pg.5215]    [Pg.5217]    [Pg.509]    [Pg.1068]    [Pg.1477]    [Pg.5214]    [Pg.5216]    [Pg.52]    [Pg.24]   
See also in sourсe #XX -- [ Pg.318 , Pg.322 , Pg.324 ]

See also in sourсe #XX -- [ Pg.138 ]

See also in sourсe #XX -- [ Pg.564 ]




SEARCH



Aldehyde asymmetric nucleophilic addition

Aldehyde catalytic asymmetric

Aldehydes asymmetric additions

Aldehydes asymmetric alkynylation

Aldehydes asymmetric allylations

Aldehydes asymmetric conjugate addition

Aldehydes asymmetric hydroformylation

Aldehydes asymmetric hydrosilylations

Aldehydes asymmetric reactions

Aldehydes asymmetric reductions

Aldehydes asymmetric synthesis

Aldehydes asymmetric vinylation

Aldehydes conjugated, asymmetric epoxidation

Aldehydes direct asymmetric aldol reaction

Aldehydes direct catalytic asymmetric aldol

Aldehydes, a-alkoxy 1,2-asymmetric induction

Aldehydes, asymmetric alkylation

Aldehydes, asymmetric alkylation dialkylzinc reagents

Aldehydes, asymmetric allylation

Aldehydes, asymmetric catalysis

Aldehydes, asymmetric catalysis hydrophosphonylation

Aldehydes, fluorinated asymmetric

Aldol reaction asymmetric aldehydes

Alkenylzinc reagents, asymmetric additions, aldehydes

Amino aldehydes, asymmetric

Amino aldehydes, asymmetric hydroformylation

Asymmetric Addition Reactions to Aliphatic Aldehydes

Asymmetric Addition of Cyanide and Isocyanide to Aldehydes or Imines

Asymmetric CDC Reactions of Aldehydes via Organo-SOMO Catalysis

Asymmetric Cyanosilylation of Aldehydes

Asymmetric Diethyl Zinc Addition to Aldehydes

Asymmetric Hydrophosphonylation of Aldehydes and Imines

Asymmetric Nucleophilic Acylations with Synthetic Equivalents for the Active Aldehydes

Asymmetric Reactions of Aldehydes, Ketones, and Acetals

Asymmetric a-alkylation aldehydes and ketones

Asymmetric addition to aldehyde

Asymmetric additions of diethylzinc to aldehydes

Asymmetric aldehyde formation

Asymmetric alkylation of aldehydes

Asymmetric allylation of aldehydes, ketones, and acetals

Asymmetric catalysis aldehyde hydrophosphonylations

Asymmetric hydrophosphonylation aldehydes

Asymmetric reduction of aldehydes

Asymmetric reduction of aldehydes and ketones

Asymmetric with aldehydes

Borane, allyldiisopinocampheylreactions with aldehydes asymmetric synthesis

Catalytic asymmetric additions, aldehydes

Catalytic asymmetric alkenylations, aldehydes

Catalytic asymmetric cyanosilylation of aldehydes

Diethylzinc, asymmetric addition aldehyde

Regioselective or Asymmetric 1,2-Addition to Aldehydes

Rhodium(I)-Catalyzed Asymmetric Hydroacylation of Olefins and Alkynes with Aldehydes

© 2024 chempedia.info