The First Direct Enzymatic Hydrolysis of Alicyclic β-Amino Esters: A Route to Enantiopurecis andtrans β-Amino Acids
作者:Enikõ Forró、Ferenc Fülöp
DOI:10.1002/chem.200700257
日期:2007.7.27
The first direct enzymatic method is reported for the synthesis of cis and trans beta-amino acid enantiomers through the lipase-catalyzed enantioselective hydrolysis of alicyclic beta-amino esters in organic media. High enantioselectivities (E usually >100) were observed when the Candida antarctica lipase B catalyzed reactions were performed with H2O (0.5 equivalents) in iPr2O at 65 degrees C. The
Asymmetric synthesis of (–)-(1R,2S)-cispentacin and related cis- and trans-2-amino cyclopentane- and cyclohexane-1-carboxylic acids
作者:Stephen G. Davies、Osamu Ichihara、Isabelle Lenoir、Iain A. S. Walters
DOI:10.1039/p19940001411
日期:——
The antifungal antibiotic (–)-(1R,2S)-2-aminocyclopentane-1-carboxylic acid (cispentacin)8 and its cyclohexane homologue 14 have been prepared utilizing the highly stereoselective conjugate addition of homochiral lithium N-benzyl-N-α-methylbenzylamide 5. The corresponding trans-β-amino acids 10 and 16 were also prepared via the selective epimerization of the cis-β-amino ester conjugate addition products
Development of Low‐Molecular‐Weight Organogelators from Cyclic β‐Amino Acid: Effect of Stereochemistry and their Application on Visual Chiral Recognition of Amines
Low molecular weight organogelators derived from chiral cyclic β-amino acids were developed and the effect of their stereochemistry on gelation behavior was investigated. After characterization of the gelators and resultant xerogels, the prepared chiral gel was further applied to the visual chiral recognition of two enantiomers of amines.
Solid-phase synthesis of 6,7-cycloalkane-fused 1,4-diazepane-2,5-diones via a cyclization/release strategy
作者:Jurgen Caroen、An Clemmen、Judit Kámán、Fréderique Backaert、Jan L. Goeman、Ferenc Fülöp、Johan Van der Eycken
DOI:10.1016/j.tet.2015.11.023
日期:2016.1
A solid-phase synthesis procedure for the parallel preparation of 6,7-cycloalkane-fused 1,4-diazepane-2,5-diones is described. The methodology applies alpha- and alicyclic beta-amino acid building blocks to construct the seven-membered heterocyclic core, while alcohols are used for further skeletal decoration. The use of a cyclization/release strategy permits the isolation of the target cyclic alpha,beta-dipeptides in good crude purities and generally moderate to good yields. A 26-membered model library is reported and NMR spectroscopical data are used to describe the overall conformational behaviour of the obtained homodiketopiperazines. (C) 2015 Elsevier Ltd. All rights reserved.