522644-10-6Relevant academic research and scientific papers
Lipase-catalyzed enantioselective ring opening of unactivated alicyclic-fused beta-lactams in an organic solvent.
Forro, Eniko,Fueloep, Ferenc
, p. 1209 - 1212 (2003)
[reaction: see text] A highly efficient and very simple method was developed for the synthesis of enantiopure beta-amino acids (e.g. cispentacin) and beta-lactams through the enzyme-catalyzed enantioselective ring opening of unactivated alicyclic beta-lac
Efficient enzymatic routes for the synthesis of new eight-membered cyclic β-amino acid and β-lactam enantiomers
Forró, Eniko,Kiss, Loránd,árva, Judit,Fül?p, Ferenc
, (2018/01/17)
Efficient enzymatic resolutions are reported for the preparation of new eight-membered ring-fused enantiomeric β-amino acids [(1R, 2S)-9 and (1S, 2R)-9] and β-lactams [(1S, 8R)-3, (1R, 8S)-3 (1S, 8R)-4 and (1R, 8S)-7], through asymmetric acylation of (±)-4 (E > 100) or enantioselective hydrolysis (E > 200) of the corresponding inactivated (±)-3 or activated (±)-4 β-lactams, catalyzed by PSIM or CAL-B in an organic solvent. CAL-B-catalyzed ring cleavage of (±)-6 (E > 200) resulted in the unreacted (1S, 8R)-6, potential intermediate for the synthesis of enantiomeric anatoxin-a. The best strategies, in view of E, reaction rate and product yields, which underline the importance of substrate engineering, are highlighted.
Synthesis of alicyclic trans-β-amino acids from cis-β- hydroxycycloalkane-carboxylates
Kiss, Lorand,Forro, Eniko,Bernath, Gabor,Fueloep, Ferenc
, p. 1265 - 1268 (2007/10/03)
A simple and efficient method is described for the preparation of both racemic and enantiopure trans-β-amino acids with a cycloheptane or cyclooctane skeleton, starting from racemic and enantiopure ethyl cis-2-hydroxycarboxylates. Georg Thieme Verlag Stut
Preparation of (1R,8S)- and (1S,8R)-9-azabicyclo[6.2.0]dec-4-en-10-one: Potential starting compounds for the synthesis of anatoxin-a
Forro, Eniko,Arva, Judit,Fueloep, Ferenc
, p. 643 - 649 (2007/10/03)
9-Azabicyclo[6.2.0]-dec-4-en-10-one (±)-2, obtained from cyclooctadiene by addition of chlorosulfonyl isocyanate, was N-hydroxymethylated to (±)-3 and then resolved by lipase-catalysed asymmetric acylation of the primary OH group at the (S)-stereogenic centre. High enantioselectivity (E = 94) was observed when lipase PS and vinyl butyrate were used in di-iso-propyl ether at -15°C, resulting in the enantiomerically enriched ester 3a and alcohol 3b (e.e. ≥92%). Treatment of 3a and 3b with NH4OH/MeOH afforded the corresponding β-lactams (1R,8S)-2a and (1S,8R)-2b (e.e. ≥93%), potential starting compounds in anatoxin-a synthesis. The ring opening of lactams (±)-2, (±)-7, 3a and 3b, followed by reduction, resulted in racemic 4-6 and 8 and enantiomeric 4a, 4b, 5a and 5b eight-membered cyclic β-amino acid derivatives.
