104112-29-0Relevant academic research and scientific papers
Synthesis of novel chiral cholic acid-based molecular tweezers containing unsymmetrically disubstituted urea units using microwave irradiation
Zeng, Bitao,Zhao, Zhigang,Zhou, Lijun,Li, Qinghan
scheme or table, p. 206 - 209 (2012/09/08)
An efficient procedure has been developed for the synthesis of new chiral cholic acid molecular tweezer artificial receptors by linking an unsymmetrically disubstituted urea to methyl deoxycholate via a carbonate chain using microwave irradiation. The structures of these new receptors were confirmed by 1H NMR, IR, MS spectra and elemental analysis. Their binding properties were examined by UV-Vis spectra titration. The preliminary results indicate that these molecular tweezers not only recognised anions, but also showed good enantioselectivity for D-amino acid methyl esters.
Solvent-free synthesis of novel chiral unsymmetrical urea molecular tweezers under microwave irradiation
Zhao, Zhigang,Xia, Zhenyang,Li, Xiaorui,Shi, Peiyu
scheme or table, p. 47 - 50 (2011/05/04)
Seven novel chiral unsymmetrical urea molecular tweezers based on 1, 3-phenoxyacetic acid have been designed and synthesised using solid K 2CO3 as supporter in the solvent-free conditions under microwave irradiation. This method is simple, fast, efficient and eco-friendly. The structures of target compounds were characterised by IR, 1H NMR, MS spectra and elemental analyses and their molecular recognition properties were investigated by UV-Vis spectral titration. The preliminary results indicated that these molecular tweezers possess good selectivity for D/L amino acid methyl esters and some anions.
The synthesis of novel chiral cholic acid-based molecular clefts containing unsymmetrically disubstituted urea unit
Mu, Qi Ming,Xue, Cui Hua,Zhang, Qing Hua,Chen, Shu Hua
, p. 3055 - 3061 (2007/10/03)
A novel type of chiral molecular clefts has been designed and synthesized by linking an unsymmetrically disubstituted urea to methyl deoxycholate via a carbonate chain. The structures of these new receptors 3a-d were confirmed by 1H NMR, IR, MS
Isocyanates, Part 4.10 Convenient Phosgene-Free Method for the Synthesis and Derivatization of Enantiopure α-Isocyanato Carboxylic Acid Esters
Kn?lker, Hans-Joachim,Braxmeier, Tobias
, p. 925 - 928 (2007/10/03)
A novel phosgene-free procedure for the synthesis of α-isocyanato carboxylic acid esters starting from α-amino acid esters has been achieved. The isocyanates are obtained enantiomerically pure (> 99% ee) by a DMAP-catalyzed isocyanation with di-tert-butyl
Chiral Analysis of Synthetic Peptides: High Performance Liquid Chromatography of Diastereoisomeric Carbamoyl Esters derived from N-Terminal Cleavage
Davies, John S.,Enjalbal, Christine,Llewellyn, Gareth
, p. 1225 - 1231 (2007/10/02)
A cleavage routine for chiral analysis has revealed that the N-terminal residue in model dipeptides, after derivatisation with a chiral isocyanate reagent, can be cleaved off as the N-carbamoyl ester under relatively mild conditions (MeOH/SOCl2/60 deg C f
