Direct Asymmetric syn-Aldol Reactions of Linear Aliphatic Ketones with Primary Amino Acid-Derived Diamines
作者:Anneleen L. W. Demuynck、Jozef Vanderleyden、Bert F. Sels
DOI:10.1002/adsc.201000419
日期:2010.10.4
novel class of chiral diamine organocatalysts based on natural primary amino acids that efficiently catalyzesyn-selective aldol reactions of challenging linear ketones, such as 2-butanone, and aromatic aldehydes. In the presence of trifluoroacetic acid (TFA) as Brønsted acid and 2,4-dinitrophenol (DNP) as co-catalyst, syn-aldol products have been obtained with excellent enantioselectivities of up to> 99%
Solid Acids as Heterogeneous Support for Primary Amino Acid-Derived Diamines in Direct Asymmetric Aldol Reactions
作者:Anneleen L. W. Demuynck、Li Peng、Filip de Clippel、Jozef Vanderleyden、Pierre A. Jacobs、Bert F. Sels
DOI:10.1002/adsc.201000871
日期:2011.3.28
non‐covalent immobilization of chiral primary amino acid‐derived diamines on organic and inorganic sulfonated solid acids through acid‐base interaction. With the commercial sulfonated fluoropolymer nafion® NR50 as support an optimal balance was found between activity and stereoselectivity of the supported catalyst in direct asymmetric aldol reactions of linear ketones and aromatic aldehydes. Under optimized