275826-36-3

Usage

Chemical Properties

White powder

InChI:InChI=1/C9H10BrNO2/c10-7-3-1-6(2-4-7)8(11)5-9(12)13/h1-4,8H,5,11H2,(H,12,13)/t8-/m0/s1

Upstream product

• 275826-32-9 3-amino-3-(4-bromophenyl)propionic acid ethyl ester 
• 14091-15-7 p-bromo-DL-phenylalanine 
• 453557-71-6 3-amino-3-(4-bromophenyl)propionic acid methyl ester 
• 39773-47-2 3-amino-3-(4'-bromophenyl)propanoic acid 

Downstream Products

• 1143534-62-6 (S)-3-amino-3-(4-bromophenyl)propan-1-ol 
• 261761-47-1 (3S)-methyl 3-amino-3-(4-bromophenyl)propionate 
• 1424703-85-4 C₃₃H₄₀BrN₉O₁₅P₂ 
• 1424703-81-0 (S)-N-(4-pentenoyl)-β-(p-bromophenyl)-β-alanine cyanomethyl ester 

Relevant academic research and scientific papers

Influence of the aromatic moiety in α- And β-arylalanines on their biotransformation with phenylalanine 2,3-aminomutase from: Pantoea agglomerans

In this study enantiomer selective isomerization of various racemic α- and β-arylalanines catalysed by phenylalanine 2,3-aminomutase from Pantoea agglomerans (PaPAM) was investigated. Both α- and β-arylalanines were accepted as substrates when the aryl moiety was relatively small, like phenyl, 2-, 3-, 4-fluorophenyl or thiophen-2-yl. While 2-substituted α-phenylalanines bearing bulky electron withdrawing substituents did not react, the corresponding substituted β-aryl analogues were converted rapidly. Conversion of 3- and 4-substituted α-arylalanines happened smoothly, while conversion of the corresponding β-arylalanines was poor or non-existent. In the range of pH 7-9 there was no significant influence on the conversion of racemic α- or β-(thiophen-2-yl)alanines, whereas increasing the concentration of ammonia (ammonium carbonate from 50 to 1000 mM) inhibited the isomerization progressively and decreased the amount of the by-product (i.e. (E)-3-(thiophen-2-yl)acrylic acid was detected). In all cases, the high ee values of the products indicated excellent enantiomer selectivity and stereospecificity of the isomerization except for (S)-2-nitro-α-phenylalanine (ee 92%) from the β-isomer. Substituent effects were rationalized by computational modelling revealing that one of the main factors controlling biocatalytic activity was the energy difference between the covalent regioisomeric enzyme-substrate complexes.

Development of a commercial process for (S)-β-phenylalanine (1)

The development of a commercial manufacturing route for (S)-β-phenylalanine 8, a key pharmaceutical building block, is described. The different approaches which were investigated, based on catalytic asymmetric hydrogenation of enamide intermediates and on biocatalysis using acylase and lipase hydrolyses, are compared. The lipase resolution route was chosen for scale-up, and the final two-step process, based on readily available raw materials, is shown to be robust at full manufacturing scale

Stereoselective chemoenzymatic preparation of β-amino esters: Molecular modelling considerations in lipase-mediated processes and application to the synthesis of (S)-dapoxetine

A wide range of optically active 3-amino-3-arylpropanoic acid derivatives have been prepared by means of a stereoselective chemoenzymatic route. The key step is the kinetic resolution of the corresponding β-amino esters. Although the enzymatic acylations of the amino group with ethyl methoxyacetate showed synthetically useful enantioselectivities, the hydrolyses of the ester group catalyzed by lipase from Pseudomonas cepacia have been identified as the optimal processes concerning both activity and enantioselectivity. The enantiopreference of this lipase in these reactions has been explained, at the molecular level, by using a fragment-based approach in which the most favoured binding site for a phenyl ring and the most stable conformation of the 3-aminopropanoate core nicely match the (S)-configuration of the major products. The conversion and enantioselectivity values of the enzymatic reactions have been compared in order to understand the influence of the different substitution patterns present in the phenyl ring. This chemoenzymatic route has been successfully applied to the preparation of a valuable intermediate in the synthesis of (S)-dapoxetine, which has been chemically synthesised in excellent optical purity.

Preparation of enantiomerically enriched aromatic β-amino acids via enzymatic resolution

A range of enantiomerically enriched aromatic β-amino acids with high e.e. have been prepared via enzymatic resolution of ethyl ester derivatives. (C) 2000 Elsevier Science Ltd.