56211-88-2

Upstream product

• 75531-12-3 p-nitrophenyl N-dodecanoyl-D-phenylalaninate 
• 112-16-3 n-dodecanoyl chloride 
• 673-06-3 D-(R)-phenylalanine 
• 13033-84-6 D-phenylalanine methyl ester hydrochloride 
• 75531-07-6 p-nitrophenyl n-dodecanoyl-D(L)-phenylalaninate 
• 75531-11-2 N-dodecanoyl-L-phenylalanine 4-nitrophenylester 
• 75531-12-3 N-dodecanoyl-D-phenylalanine 4-nitrophenylester 

Relevant academic research and scientific papers

Enantioselective hydrolysis of long chain α-amino acid esters by chiral sulfur-containing macrocyclic metallomicelles

A novel chiral lipophilic sulfur-containing macrocyclic ligand 5 with bis-pendant alcohols in the proximity of the coordination center has been synthesized. Its metal ion complexes have been investigated as catalysts for the enantioselective hydrolysis of long chain α-amino acid esters in aqueous comicellar solution with Brij35. Large rate accelerations (up to 220 times) and moderate enantioselectivities (up to 4.85 (k(S)/k(R))) employing the macrocyclic 5-Cu2+ have been observed, whereas the acyclic 3-Cu2+ exhibits less reactivity and stereoselectivity. Taking the analogous ligand 4, lacking the hydroxy groups leads to a dramatic rate decrease, and an inversion of enantioselectivity is observed. The pKa value of the hydroxyl bound to Cu2+ is determined to be pKa=7.2 under our micellar reaction conditions.

Mechanoresponsive, proteolytically stable and biocompatible supergelators from ultra short enantiomeric peptides with sustained drug release propensity

Stimuli-responsive low molecular weight hydrogelators attract immense interest from diverse segments of biomedicine and biotechnology. Distinctly, herein we report newly synthesized enantiomeric ultrashort peptides of general formula Me-(CH2)8-CO-NH-CH(X)-COOH, where X = CH2Ph in hydrogelators I (l-Phe) and II (d-Phe) respectively, which display excellent self-assembling propensity in physiological buffer at room temperature. Interestingly these biomolecules were endowed with mechanoresponsiveness, injectability and high mechanical integrity as confirmed by rheological measurements. Importantly they revealed resistance towards proteolytic degradation. Indeed dose dependent cell viability studies using MTT assay in four different cell lines, namely PANC-1, S1, HCT-116 and MDAMB-231, further confirmed the biocompatibility of the hydrogelators in vitro. The structural aspect of β-sheets of the hydrogelators was concluded on the basis of temperature dependent NMR, IR, PXRD and computational studies. We developed a user friendly delivery system, hydrogel nanoparticles (HNPs), with our mechanoresponsive and biocompatible hydrogelators, as these particles exhibited promising influence due to their enhanced surface area. Also the HNPs revealed excellent drug release kinetics for the model drugs 5FU/doxorubicin under physiological conditions in a sustained manner depending on the physicochemical parameters of the drugs. Taking these results together we envision that our designed hydrogelators and the delivery vehicle generated therefrom might represent a promising tool for administration of significant drug concentrations at lesion sites for a prolonged period, thus providing a better strategy for quick pain relief, rapid recovery and reduced systemic side effects.

Enantioselective ester hydrolysis by an achiral catalyst co-embedded with chiral amphiphiles into a vesicle membrane

Co-embedding of an amphiphilic non-chiral hydrolysis catalyst with amphiphilic chiral additives into the membrane of a phospholipid vesicle induces different rates of ester hydrolysis for enantiomeric amino acid esters.

FATTY ACID ACYLATED D-AMINO ACIDS FOR ORAL PEPTIDE DELIVERY

The present invention relates to fatty acid acylated amino acids (FA-Daa's) acting as permeation enhancers for oral delivery of therapeutic macromolecules such as peptides and pharmaceutical compositions comprising such FA-Daa's.

Steric-control for the enantioselective hydrolysis of amino acid esters in hybrid membrane systems.

The enantioselective hydrolysis of the amino acid esters, p-nitrophenyl-N-dodecanoyl-D(L)-phenylalaninates (C(12)-D(L)-Phe-PNP) catalyzed by active tripeptide, N-(benzyloxycarbonyl)-L-phenylalanyl-L-histidyl-L-leucine (Z-PheHisLeu) in the presence of coag

Fairly marked enantioselectivity for the hydrolysis of amino acid esters by chemically modified enzymes

The hydrolysis (deacylation) of enantiomeric substrates by the chemically modified enzymes decanoyl-α-chymotrypsin and decanoyl-trypsin was studied. Reaction activity for decanoyl-α-chymotrypsin was lower than that for the native enzyme, although intriguingly the enantioselectivity was markedly enhanced as compared with the native enzyme. In particular, the apparently complete enantioselective catalysis was attained for the hydrolytic cleavage of p-nitrophenyl N-dodecanoyl- D(L)-phenylalaninates. The enhancement of enantioselectivity, however, was not observed for decanoyl-trypsin. These results suggest that the chemically modified α-chymotrypsin by addition of hydrophobic groups has promoted enantioselectivity for the hydrolysis of hydrophobic esters.

Steric-control for the enantioselective hydrolysis of amino acid esters with membrane-bound enzyme models

The apparently complete stereoselectivity (K(L)(a,obsd)/k(D)(a,obsd)=(∞) for the hydrolysis of enantiomeric substrate (p-nitrophenyl n-dodecanoyl-D(L)-phenyalaninate; C(t2)-D(L)-Phe-PNP) catalyzed by active tripeptide (N-(benzyloxycarbonyl)-L-phenylalanyl-L- histidyl-L-leucine; Z-PheHisLeu) was attained by regulating the composition of coaggregates, ionic strength, and temperature, in coaggregate systems composed of vesicular and micellar surfactants. This can be related to the optimization of conformation in the Z-PheHisLeu catalyst to react with amino acid esters by changing of physical properties of coaggregates.

Synthesis of novel chiral lipophilic pyridyl-containing β-amino alcohol ligands and enantioselective hydrolysis of α-amino acid esters by chiral metallomicelles

Seven novel chiral lipophilic pyridyl-containing β-amino alcohol ligands have been synthesized by coupling of 6-alkoxymethyl-2- chloromethylpyridine 3 with the corresponding chiral β-amino alcohols or L- cysteine. Their metal ion complexes have been inves

Remarkable Salt Effects in the Highly Enhanced Enantioselective Hydrolysis of Amino Acid Esters with the Active Tripeptide in the Vesicular System

The remarkably high enantioselectivity (kLa,obsd/kDa,obsd = 67) was attained along with the large rate-enhancement of the L-form substrate for the hydrolytic cleavage of N-dodecanoyl-D(L)-Phe-PNP by controlling the ionic strength ( = 0.03 M, 1 M = 1 mol dm-3) in the vesicular system.

Mechanism of Enantioselective Ester Cleavage by Histidine-Containing Dipeptides at a Micellar Interface

Chiral p-nitrophenyl esters derived from the amino acid phenylalanine are cleaved by histidine-containing dipeptides at a micellar interface.High enantioselectivities (up to kL/kD = 30.4 at 0 deg C) are observed.Both the substrates and the catalysts contain an alternating sequence of hydrophobic and hydrophilic groups.Due to the need for hydration of the hydrophilic groups, the hydrophobic groups cannot dissolve completely into the micellar hydrocarbon phase.The kinetic data suggest that the micellar interface is capable of discriminating between transition states that have different hydrophilic and hydrophobic properties.One of the diastereomeric transition states is characterized by a hydrogen bond between the amide CO group of the ester and an NH group of the histidine-containing dipeptide.Upon formation of this hydrogen bond these polar CO and NH groups lose their hydrophilicity which allows the transfer of the adjacent apolar groups to the micellar hydrocarbon phase.The other diastereomeric transition state cannot form this hydrogen bond and the hydrophobic groups remain hydrated.Consequently, the latter transition state is of higher energy.The kinetic data reveal that it is important to prevent steric hinderance between the reactants in order to allow the unhindered formation of the hydrogen bond.