13171-96-5

Upstream product

• 3005-89-8 ethyl N-benzyloxycarbonyl-L-leucyl-L-phenylalaninate 
• 10473-38-8 N-(benzyloxycarbonyl)-L-leucyl-L-phenylalanine methyl ester 
• 6401-63-4 N-benzyloxycarbonyl-L-leucyl-L-phenylalanine 
• 51021-87-5 N-benzyloxycarbonyl-L-leucine methyl ester 
• 65864-22-4 (S)-2-amino-3-phenylpropionamide hydrochloride 
• 2018-66-8 Z-Leu-OH 
• 5241-58-7 L-Phenylalanine amide 

Downstream Products

• 6401-63-4 N-benzyloxycarbonyl-L-leucyl-L-phenylalanine 
• 10473-38-8 N-(benzyloxycarbonyl)-L-leucyl-L-phenylalanine methyl ester 

Relevant academic research and scientific papers

Mechanoenzymatic peptide and amide bond formation

Mechanochemical chemoenzymatic peptide and amide bond formation catalysed by papain was studied by ball milling. Despite the high-energy mixing experienced inside the ball mill, the biocatalyst proved stable and highly efficient to catalyse the formation of α,α- and α,β-dipeptides. This strategy was further extended to the enzymatic acylation of amines by milling, and to the mechanosynthesis of a derivative of the valuable dipeptide L-alanyl-l-glutamine.

Enzymatic C-terminal amidation of amino acids and peptides

Herein, we describe two versatile and high yielding enzymatic approaches for the conversion of semi-protected amino acid and peptidyl C-terminal α-carboxylic acids into their corresponding amides. In the first approach, the lipase Candida antarctica lipase-B (Cal-B), and in the second approach, the protease Subtilisin A, are used, respectively. We found that by using the ammonium salt of the α-carboxylic acid instead of separate ammonia sources, the enzymatic amidation reactions proceeded much faster without side reactions and gave near to quantitative yields of products.

Efficient chemo-enzymatic synthesis of endomorphin-1 using organic solvent stable proteases to green the synthesis of the peptide

Endomorphin-1 (Tyr-Pro-Trp-Phe-NH2, EM-1), an effective analgesic, was efficiently synthesized by a combination of enzymatic and chemical methods. Peptide Boc-Trp-Phe-NH2 was synthesized with a high yield of 97.1% by the solvent-stab

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.

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.