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Relevant academic research and scientific papers

Natural eutectogels: Sustainable catalytic systems for C-C bond formation reactions

Natural eutectogels were prepared by combining the properties of amino acids with the ones of deep eutectic solvents. The soft materials obtained were fully characterised by determining the gel-sol transition temperatures and analysing the mechanical and

(2S,4R)-Hyp-(S)-Phe-OMe dipeptide supported on imidazolium tagged molecules as recoverable organocatalysts for asymmetric aldol reactions using water as reaction medium

Four novel chiral imidazolium tagged molecules derived from dipeptide (2S,4R)-Hyp-(S)-Phe-OMe were prepared and evaluated as organocatalysts in the asymmetric aldol reaction using water as solvent. It was found that catalysts incorporating the hexanoyl linker are active down to 5 mol% and afford aldol products with up to 94% yield, up to 98:2 dr and up to 97:3 er. This chiral imidazolium catalyst was reused up to 6 times without any loss in the stereoselectivity of asymmetric aldol reactions. By contrast, organocatalysts containing an acetyl linker proved to be highly unstable in protic solvents, and for that reason they could not be recovered and reused.

Towards Sustainable Amino Acid Derived Organocatalysts for Asymmetric syn-Aldol Reactions

The undesirable side-processes responsible for the fast deactivation of primary amino acid derived organocatalysts in asymmetric aldol reactions are identified. A new ionic-liquid-supported (S)-valine-/(S)-α,α-diphenylserinol-derived catalyst (9) is desig

Novel L-threonine-based ionic liquid supported organocatalyst for asymmetric syn-aldol reactions: activity and recyclability design

A novel recyclable threonine-derived ionic-liquid-supported organocatalyst of asymmetric cross-aldol reactions has been developed. In its presence, aromatic aldehydes react with hydroxyacetone, methoxyacetone and 2-butanone to afford the corresponding syn

A phosphotungstic acid-supported multifunctional organocatalyst containing 9-amino(9-deoxy): Epi -cinchonidine and Br?nsted acid and its application in asymmetric aldol reaction

A novel type of supported multifunctional organocatalyst CDNH2(n)-HPW combined 9-amino(9-deoxy)epi-cinchonidine (CDNH2) with Br?nsted acid in the backbone of phosphotungstic acid was developed via facile precipitation of sodium tungs

Pepsin-catalyzed direct asymmetric aldol reactions for the synthesis of vicinal diol compounds

The catalytic promiscuity of pepsin from porcine gastric mucous was observed in catalysis of the direct asymmetric aldol reactions of aromatic aldehydes with acetones, which were substituted by hydroxy-, dihydroxy-, methoxy- and benzyloxy- for the synthes

Induced chirality in a metal-organic framework by postsynthetic modification for highly selective asymmetric aldol reactions

A straightforward synthetic route to chiral metal-organic frameworks 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 the majority of the activity was preserved, as was the enantioselectivity.

Synthesis of zirconium phosphonate supported L-proline as an effective organocatalyst for direct asymmetric aldol addition

Stable L-proline-functionalized zirconium methyl- and/or phenylphosphonates have been prepared as amorphous solids by the precipitation of (4R)-4-[(4′-phosphonobenzyl)oxy]-L-proline and methyl- and/or phenylphosphonic acid with ZrOCl2. The supported L-proline catalysts were tested in the direct asymmetric aldol addition between several ketones and p-substituted benzaldehydes. High yields, diastereoselectivities (anti/syn up to 92:8) and enantiomeric excesses (up to 99 % ee) have been achieved. Moreover, an easy protocol for the efficient recovery of the catalytic system by simple centrifugation has been defined, and the effective reuse of the catalyst has been reported in the representative aldol addition of cyclohexanone with p-nitrobenzaldehyde. This study has shown that these L-proline immobilized catalytic systems can be used at least six times without loss of activity and with reproducible anti/syn and ee values. Copyright

An enantioselective recyclable polystyrene-supported threonine-derived organocatalyst for aldol reactions

A series of primary amino acids covalently supported onto polystyrene through alkyne-azide cycloaddition reactions has been synthesized and evaluated as catalysts in asymmetric aldol reactions. A polymer-supported threonine behaves as an easily recyclable, highly reactive and stereoselective (up to 99% ee) catalyst in the aldol reaction of both cyclic and acyclic ketone donors with aromatic aldehydes in aqueous environments. While cyclic ketones react with anti diastereoselectivity, syn adducts are predominantly obtained with acyclic substrates. The heterogenized threonine catalyst has been used for the sequential synthesis of a small library of enantiopure aldol products.

Additive-controlled regioselective direct asymmetric aldol reaction of hydroxyacetone and aldehyde

A structurally simple dipeptide derivative 1b prepared from l-proline and l-valine has been developed for the direct asymmetric aldol reaction of hydroxyacetone and various aldehydes with moderate to high yields and high enantioselectivities. More importa