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
Induced Chirality in a Metal-Organic Framework by Postsynthetic Modification for Highly Selective Asymmetric Aldol Reactions
作者:Anneleen L. W. Demuynck、Maarten G. Goesten、Enrique V. Ramos-Fernandez、Michiel Dusselier、Jozef Vanderleyden、Freek Kapteijn、Jorge Gascon、Bert F. Sels
DOI:10.1002/cctc.201402082
日期:2014.8
A straightforward synthetic route to chiralmetal–organicframeworks is proposed that relies on an acid–base interaction between an acid linker and a chiral primary amino acid derived diamine organocatalyst. High ee values for the aldol condensation of linear ketones and aromatic aldehydes are reported with this heterogeneous catalyst. Three consecutive catalyst reuse experiments demonstrated that
Retro-aldol reactions of β-hydroxy ketones take place under rhodium catalysis, leading to regioselective formation of the corresponding rhodium enolates. The enolates react with aldehydes in situ to afford the corresponding aldol adducts in high yields.