618856-85-2Relevant 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.
UREAphos: Supramolecular bidentate ligands for asymmetric hydrogenation
Sandee, Albertus J.,Van Der Burg, Alida M.,Reek, Joost N. H.
, p. 864 - 866 (2007/10/03)
Supramolecular bidentate phosphite ligands are presented as a new class of ligands for rhodium catalysed asymmetric hydrogenation. The Royal Society of Chemistry.
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
