216311-58-9Relevant academic research and scientific papers
Enzymatic resolution of n-substituted-β-prolines
Mendiola, Javier,Garcia-Cerrada, Susana,De Frutos, Oscar,De La Puente, Maria Luz,Gu, Rui Lin,Khau, Vien V.
scheme or table, p. 292 - 296 (2010/04/22)
A general and straightforward strategy for enzymatic resolution of N-substituted-β-proline has been successfully designed and developed in our research laboratories. A first affinity screen is followed by ratio enzyme/substrate optimization to source our
A chemoenzymatic approach to the synthesis of enantiomerically pure aza analogues of paraconic acid methyl ester and both enantiomers of methyl β-proline
Felluga, Fulvia,Pitacco, Giuliana,Prodan, Massimo,Pricl, Sabrina,Visintin, Marco,Valentin, Ennio
, p. 3241 - 3249 (2007/10/03)
Enantiopure methyl esters of 1-alkyl-5-oxo-3-pyrrolidinecarboxylic acids were obtained by enzymatic resolution of the corresponding chiral racemic mixtures. A particularly favourable interaction, also supported by molecular mechanics calculations, was observed between the 1-benzyl derivative and α-chymotrypsin, for which the enantiomeric ratio, E, exceeded 200. The absolute configurations of the lactams were determined by means of CD spectroscopy. From the resulting enantiomerically pure (99% e.e.) (S)-(+)-1-benzyl-3-pyrrolidinecarboxylic acid and methyl (R)-(-)-1-benzyl-3-pyrrolidinecarboxylate, the methyl esters of (+) and (-)-β-proline were synthesised in 99% e.e. and 18 and 22% overall yield, respectively.
A practical ex-chiral-pool synthesis of β-proline and homo-β-proline
Thomas, Christoph,Orecher, Florian,Gmeiner, Peter
, p. 1491 - 1496 (2007/10/03)
Starting from aspartic acid an efficient synthesis of enantiomerically pure β-proline and homo-β-proline is described. The key step of the synthesis includes formation of the 1,4-biselectrophile 6, followed by rearrangement via the aziridinium intermediate 7 and ring closure to give the pyrrolidinium salt 9a which can serve as a common precursor for both target compounds.
