3397-35-1

Usage

Chemical Description

Z-Leu-OSu is a chemical used as a reagent for the synthesis of amides.

InChI:InChI=1/C18H22N2O6/c1-12(2)10-14(17(23)26-20-15(21)8-9-16(20)22)19-18(24)25-11-13-6-4-3-5-7-13/h3-7,12,14H,8-11H2,1-2H3,(H,19,24)

Upstream product

• 6066-82-6 1-hydroxy-pyrrolidine-2,5-dione 
• 2018-66-8 Z-Leu-OH 

Downstream Products

• 40290-56-0 Cbz-Leu-Ser-OMe 
• 7801-71-0 N-benzyloxycarbonyl-L-leucyl-L-leucine 
• 42537-96-2 N-(N-benzyloxycarbonyl-L-leucyl)-L-isoleucine 
• 60668-10-2 [(N-benzyloxycarbonyl-L-leucyl)amino]-methyl-phosphonic acid 
• 32908-83-1 (S)-2-((S)-2-Benzyloxycarbonylamino-4-methyl-pentanoylamino)-4-carbamoyl-butyric acid tert-butyl ester 
• 102096-29-7 [(S)-1-(6-Methoxy-quinolin-8-ylcarbamoyl)-3-methyl-butyl]-carbamic acid benzyl ester 
• 39802-26-1 Z-Leu-Gln-OH 
• 52060-87-4 Z-Leu-Leu-Gln-OH 
• 33514-63-5 Z-Leu-Ser(Bu-t)-OMe 
• 83510-60-5 N-benzyloxycarbonylleucine (2-chloroethyl)amide 
• 49761-04-8 N-(benzyloxycarbonyl)-L-leucyl-L-proline methyl ester 
• 114658-32-1 Z-L-leucylcyanamide 
• 14437-50-4 (S)-methyl 2-((S)-2-(((benzyloxy)carbonyl)amino)-4-methylpentanamido)-3-(1H-indol-3-yl)propanoate 
• 135112-52-6 Z-Leu-DL-Ala-DL-Ala-DL-Ala-OBzl 

Relevant academic research and scientific papers

Mechanistic implications of the enantioselective addition of alkylzinc reagents to aldehydes catalyzed by nickel complexes with α-amino amide ligands

The enantioselective alkylation of aldehydes catalysed by nickel(ii)-complexes derived from α-amino amides was studied by means of density functional theory (DFT) and ONIOM (B3LYP:UFF) calculations. A mechanism was proposed in order to investigate the origin of enantioselectivity. The chirality-determining step for the alkylation was the formation of the intermediate complexes with the involvement of a 5/4/4-fused tricyclic transition state. The predominant products predicted theoretically were of (S)-configuration, in good agreement with experimental observations. The scope of the reaction was examined and high yields and enantioselectivities were observed for the enantioselective addition of Et2Zn and Me2Zn to aromatic and aliphatic aldehydes.

Efficient access to enantiopure γ4-amino acids with proteinogenic side-chains and structural investigation of γ4- asn and γ4-ser in hybrid peptide helices

Hybrid peptides composed of α- and β-amino acids have recently emerged as new class of peptide foldamers. Comparatively, γ- and hybrid γ-peptides composed of γ4-amino acids are less studied than their β-counterparts. However, recent investigations reveal that γ4-amino acids have a higher propensity to fold into ordered helical structures. As amino acid side-chain functional groups play a crucial role in the biological context, the objective of this study was to investigate efficient synthesis of γ4-residues with functional proteinogenic side-chains and their structural analysis in hybrid-peptide sequences. Here, the efficient and enantiopure synthesis of various N- and C-terminal free-γ4-residues, starting from the benzyl esters (COOBzl) of N-Cbz-protected (E)-α,β-unsaturated γ-amino acids through multiple hydrogenolysis and double-bond reduction in a single-pot catalytic hydrogenation is reported. The crystal conformations of eight unprotected γ4-amino acids (γ4-Val, γ4-Leu, γ4-Ile, γ4-Thr(OtBu), γ4-Tyr, γ4-Asp(OtBu), γ4- Glu(OtBu), and γ-Aib) reveals that these amino acids adopted a helix favoring gauche conformations along the central Cγi￡ Cβ bond. To study the behavior of γ4- residues with functional side chains in peptide sequences, two short hybrid γ-peptides P1 (Ac-Aib-γ4-Asn-Aib-γ4-Leu- Aib-γ4-Leu-CONH2) and P2 (Ac-Aib- γ4-Ser-Aib-γ4-Val-Aib-γ4-Val- CONH2) were designed, synthesized on solid phase, and their 12-helical conformation in single crystals were studied. Remarkably, the γ4-Asn residue in P1 facilitates the tetrameric helical aggregations through interhelical H bonding between the side-chain amide groups. Furthermore, the hydroxyl side-chain of γ4-Ser in P2 is involved in the interhelical H bonding with the backbone amide group. In addition, the analysis of 87 γ4-residues in peptide single-crystals reveal that the γ4-residues in 12-helices are more ordered as compared with the 10/12- and 12/14-helices. Copyright

Bispidine as a secondary structure nucleator in peptides

Here we describe bispidine as a scaffold for inducing open turn-like and beta sheet conformations on the attached peptides depending on the mode of attachment of peptides to the scaffold. Various bispidine-peptide conjugates were designed and synthesized to demonstrate the versatility of the scaffold.

Chiral bis(amino amides) as chiral solvating agents for enantiomeric excess determination of α-hydroxy and arylpropionic acids

A family of bis(amino amides) derived from natural amino acids has been synthesized and tested for the NMR enantiodiscrimination, as chiral solvating agents, for enantiomeric excess determination of some carboxylic acids. Those bis(amino amide) receptors contain different structural modifications and the splitting of the signals of the acids, after addition of the corresponding CSAs, depends on those structural variables. The influence of aminoacid side chain and the nature of the aliphatic spacer are important parameters to obtain good chiral discriminations. The results obtained clearly show the chiral recognition abilities of these bis(amino amide) ligands and suggest their advantageous use as chiral solvating agents for carboxylic acids. The binding between bis(amino amides) and carboxylic acids has been studied by ESI-MS, NMR, DSC, and molecular modeling. The data suggest that enantiodiscrimination involves the formation of an ionic pair after proton transfer from the carboxylic substrate to the bis(amino amides).

FLUOROGENIC PEPTIDASE SUBSTRATE

The invention is related to new peptidase substrates of formula (I) : wherein - R1 is a peptidyl or amino acid moiety directly linked to W via its carbonyl function or one of its carbonyl functions, or, R1 is a chain R'1-NH-Y-C(O)- in which R'1 is a peptidyl or amino acid moiety directly linked to the NH of the R1 chain via its carbonyl function or one of its carbonyl functions and Y is an organic spacer, - W is O, NH or NR2 with R2 representing a (C1-C4)alkyl, - T and Rb are as defined in claim 1, and a process for detecting the presence of a catalytically active peptidase, using one of such substrates.

Direct PCR amplification of various modified DNAs having amino acids: Convenient preparation of DNA libraries with high-potential activities for in vitro selection

We synthesized modified 2′-deoxyuridine triphosphates bearing amino acids at the C5 position and investigated their substrate properties for KOD Dash DNA polymerase during polymerase chain reaction (PCR). PCR using C5-modified dUTP having an amino acyl group (arginyl, histidyl, lysyl, phenylalanyl, tryptophanyl, leucyl, prolyl, glutaminyl, seryl, O-benzyl seryl or threonyl group) gave the corresponding full-length PCR products in good yield. Although dUTP analogues bearing aspartyl, glutamyl or cysteinyl were found to be poor substrates for PCR catalyzed by KOD Dash DNA polymerase, optimization of the reaction conditions resulted in substantial generation of full-length product. In the case of reaction using dUTP analogue having a cysteinyl group, addition of a reducing agent improved the reaction yield. Thus, PCRs using KOD Dash DNA polymerase together with amino acyl dUTP provide convenient and efficient preparation of various modified DNA libraries with potential protein-like activities.

Design and synthesis of tri-ring P3 benzamide-containing aminonitriles as potent, selective, orally effective inhibitors of cathepsin K

We have prepared a series of achiral aminoacetonitriles, bearing tri-ring benzamide moieties and an aminocyclohexanecarboxylate residue at P2. This combination of binding elements resulted in sub-250 pM, reversible, selective, and orally bioavailable cathepsin K inhibitors. Lead compounds displayed single digit nanomolar inhibition in vitro (of rabbit osteoclast-mediated degradation of bovine bone). The best compound in this series, 39n (CRA-013783/L-006235), was orally bioavailable in rats, with a terminal half-life of over 3 h. 39n was dosed orally in ovariectomized rhesus monkeys once per day for 7 days. Collagen breakdown products were reduced by up to 76% dose-dependently. Plasma concentrations of 39n above the bone resorption IC50 after 24 h indicated a correlation between functional cellular and in vivo assays. Inhibition of collagen breakdown by cathepsin K inhibitors suggests this mechanism of action may be useful in osteoporosis and other indications involving bone resorption.

Procedure for the oxidation of β-amino alcohols to α-amino aldehydes

A novel procedure for the mild oxidation of β-amino alcohols to α-amino aldehydes using commercially available manganese(IV) oxide is reported. There are several important advantages of the new method, such as high enantiopurity of the reaction and the absence of either over-oxidation or any reaction by-products during the process. A number of N-protected L-α-amino aldehydes was obtained. All new compounds were characterized by their NMR spectra and optical rotation data. Georg Thieme Verlag Stuttgart.

Self-assembly of small peptidomimetic cyclophanes

The self-assembly of a series of small peptidomimetic cyclophanes in organic solvents was studied. X-ray diffraction, NMR spectroscopy, and molecular modelling were used to understand the structural features of these self-assembling compounds both at the molecular and supramolecular level. The factors that could influence the formation of gels rather than crystals were studied and a model for the arrangement of molecules in the gel was proposed. Furthermore, scanning electron microscopy revealed that in some cases these compounds undergo a transcription of chirality when going from organogelator to helicoidal gel fibres.

Cathepsin B-sensitive dipeptide prodrugs. 1. A model study of structural requirements for efficient release of doxorubicin

A series of lysosomal protease-sensitive peptides attached to doxorubicin (DOX) was prepared as model substrates for internalizing anticancer immunoconjugates and potential antimetastasis prodrugs. Rates of cathepsin B-mediated release of free drug was measured for each, and human plasma stabilities for representative examples.