65118-54-9

Upstream product

• 28944-94-7 (S)-methyl 2-((S)-2-(((benzyloxy)carbonyl)amino)-3-phenylpropanamido)propanoate 
• 3338-39-4 N-benzyloxycarbonyl-L-phenylalanyl-L-alanine 
• 33208-99-0 (S)-alaninamide hydrochloride 
• 60379-01-3 N-(benzyloxycarbonyl)-L-phenylalanine benzyl ester 
• 7324-05-2 L-alanine amide 
• 4816-89-1 Cbz-Phe-OCH₂CONH₂ 
• 1161-13-3 N-Cbz-L-Phe 

Downstream Products

• 3338-39-4 N-benzyloxycarbonyl-L-phenylalanyl-L-alanine 
• 1043922-58-2 N-(benzyloxycarbonyl)phenylalanyl-alanine nitrile 
• 28944-94-7 (S)-methyl 2-((S)-2-(((benzyloxy)carbonyl)amino)-3-phenylpropanamido)propanoate 
• 7324-05-2 L-alanine amide 
• 63-91-2 L-phenylalanine 

Relevant academic research and scientific papers

Convenient primary amidation of N-protected phenylglycine and dipeptides without racemization or epimerization

Primary amidation of N-protected phenylglycine and dipeptide proceeded easily to afford the corresponding amides in 57-95% yields with 99% ee and 81-99% de, respectively. The procedure is very easy to avoid racemization and epimerization of the products in the reactions by keeping exactly the reaction temperature at -15 C when the activation of carboxylic acids, followed by the reaction of the mixed carbonic carboxylic anhydride with NH4Cl.

Azadipeptide nitriles: Highly potent and proteolytically stable inhibitors of papain-like cysteine proteases

(Chemical Presented) Nitrogen instead of carbon: Azadipeptide nitriles resulting from CH/N exchange in the P1 position (see picture) are hitherto unknown. To access these compounds by conversion of amino acid-derived hydrazides with cyanogen bromide both nitrogen atoms of the hydrazide must be substituted. Despite a methylated P2-P1 peptide bond, the azadipeptide nitriles show a strong inhibitory activity against cysteine proteases, and a high stability towards chymotryptic hydrolysis.

α-Chymotrypsin-catalyzed peptide synthesis in frozen aqueous solution using N-protected amino acid carbamoylmethyl esters as acyl donors

A kinetically controlled peptide synthesis catalyzed by α-chymotrypsin was performed in frozen aqueous solution (ice, -24 °C). The yield of the peptide was significantly improved by the use of the carbamoylmethyl (Cam) ester as the acyl donor instead of the conventional ethyl ester. The peptide yield increased up to ca. 90% when N-benzyloxycarbonyl (CBZ)-Phe-OCam and H-Phe-NH2 were used as the acyl donor and nucleophile, respectively. Such an improvement of the peptide yield in ice was also observed in the coupling of other CBZ-amino acid Cam esters as acyl donors. Furthermore, this approach was applied to the synthesis of peptides containing d-amino acids. The peptides such as CBZ-d-Phe-Phe-NH2, CBZ-Phe-d-Phe-NH2 and CBZ-d-Phe-d-Phe-NH2 were also obtained in excellent to moderate yields in ice. A high diastereoselectivity towards the l-l peptide was observed when the racemic amino acid Cam ester was used as the acyl donor in ice.

Chemically modified "polar patch" mutants of subtilisin in peptide synthesis with remarkably broad substrate acceptance: Designing combinatorial biocatalysts

A significant enhancement of the applicability of the serine protease subtilisin Bacillus lentus (SBL) in peptide synthesis was achieved by using the strategy of combined site-directed mutagenesis and chemical modification to create chemically modified mu

Glycosylation of the primary binding pocket of a subtilisin protease causes a remarkable broadening in stereospecificity in peptide synthesis

Site-selective glycosylation at position 166 at the base of the primary specificity S1 pocket in the serine protease subtilisin Bacillus lentus (SBL) created glycoproteins that are capable of catalyzing the coupling reactions of not only L- ami

Expanded structural and stereospecificity in peptide synthesis with chemically modified mutants of subtilisin

Employing the strategy of combined site directed mutagenesis and chemical modification, we previously generated chemically modified mutant enzymes (CMMs) of subtilisin Bacillus lentus (SBL). We now report the use of these SBL-CMMs for peptide coupling rea

C-terminal peptide amidation catalyzed by orange flavedo peptide amidase

The reverse reaction of amide hydrolysis can be achieved with the peptide amidase derived from oranges [Eq(1); Z=benzyloxycarbonyl]. The C-terminal carboxy group of the peptide is directly converted into an amide group by condensation with an ammonium salt. The amidation of peptides is of major interest since the biological activity of proteohormones and peptides is strongly influenced by the presence of a C-terminal amide group.

Synthesis of Amides of Dipeptides and Kinetics of Papain-catalysed Hydrolysis of These Amides

The N-benzyloxycarbonylated amides of the dipeptides L-alanyl-L-phenylalanine, L-leucylleucine, L-leucyl-L-phenylalanine, L-phenylalanyl-L-alanine and L-phenylalanyl-L-leucine have been synthesised and the kinetic parameters for the papain-catalysed hydrolysis of these substrates and their ester analogs have been determined at pH 8 and 9.All the amide substrates are hydrolysed at the amide linkage except N-benzyloxycarbonyl-L-alanyl-L-phenylalanine amide which hydrolyses to the extent of 45percent at the amide linkage and 55percent at the peptide linkage.For amide hydrolysis acetylation and deacetylation rate constants are approximately equal.