cas 128110-37-2, (1R,2S)-(-)-2-Amino-1-cyclopentanecarboxylic acid hydrochloride | Articles data ｜lookchem

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128110-37-2

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The first direct enzymatic hydrolysis of alicyclic β-amino esters: A route to enantiopure cis and trans β-amino acids
The first direct enzymatic method is reported for the synthesis of cis and trans βamino acid enantiomers through the lipase-catalyzed enantioselective hydrolysis of alicyclic β esters in organic media. High enantioselectivities (E usually > 001) were observed when the Candida antarctica lipase B catalyzed reactions were performed with H2O (0.5 equivalents) in iP iPr2O at 5°C. The resolved products, obtained in good yields (≥42%), could be easily separated.
Forro, Eniko,Fueloep, Ferenc
p. 6397 - 6401
(2008/02/13)

Efficient asymmetric synthesis of unnatural β-amino acids
The simple and highly enantioselective methanolysis of cyclic meso-anhydrides mediated by cinchona alkaloids leads to a broad variety of dicarboxylic acid mono-methyl esters with up to 99% ee. From these products, unnatural N-protected β-amino esters can be obtained by means of Curtius degradation of the corresponding acyl azides. Subsequent cleavage of the protecting groups leads to the free β-amino acids in excellent yields. By enantiomer differentiating opening of racemic anhydrides, synthetically highly useful regioisomeric amino acid esters become readily available.
Bolm,Schiffers,Dinter,Defrere,Gerlach,Raabe
p. 1719 - 1730
(2007/10/03)

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Chemical Properties

Appearance/Colour :Almost white crystalline powder
Melting Point: 173-175 °C (decomp)(Solv: ethanol (64-17-5); ethyl ether (60-29-7))
Boiling Point: 264.7 °C at 760 mmHg
Flash Point:113.9 °C
Vapor Pressure: 0.00278mmHg at 25°C
PSA: 63.32000
LogP: 1.70070

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