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Lewis base organocatalysis amino acids-derived bases

Recently, a dual organocatalysis approach, namely, the combination of the achiral nucleophilic Lewis base catalyst DMAP (23) and the chiral anion-binding thiourea catalyst 27, was applied to the Steglich rearrangement to provide a,a-disubstituted amino acid derivatives 24 in a highly enantioselective fashion (Scheme 43.5) [14]. Notably, replacement of the nucleophilic codiamino acid derivatives with excellent enantiomeric excesses (88-93% ee). [Pg.1337]

Although boron is a metalloid, one can nonetheless include boron-derived compounds in a book on organocatalysis as not being transition metal containing catalysts Planar chiral boronic acids have been employed as amide couphng catalysts, actually as bifunctional Lewis acid/base activators. Whiting s [51] group reported the preparation [52] of two amino-boronic ferrocenes (see Scheme 8.17). Their use... [Pg.211]


See other pages where Lewis base organocatalysis amino acids-derived bases is mentioned: [Pg.153]   
See also in sourсe #XX -- [ Pg.536 , Pg.537 ]




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Amino acid derivatives

Amino acid derivatives Lewis bases

Amino acids based

Amino acids deriv

Lewis Acid-Base

Lewis acids derivatives

Lewis base organocatalysis

Organocatalysis

Organocatalysis amino acids-derived bases

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