19071-54-6Relevant articles and documents
Microwave-assisted synthesis of bidentate chiral unsymmetrical urea derivatives of p-tert-butylcalix[4]arene and their anion recognition properties
Wang, Xiaohong,Zhao, Zhigang,Chen, Bailing,Li, Xiaoxiao,Liu, Min
, p. 303 - 306 (2015)
Four new derivatives of p-t-butylcalix[4]arene containing two (1,3-distal) chiral unsymmetrical urea moieties at the lower rim were synthesised in four steps. Their anion recognition properties toward MeCO2-, H2PO4-, NOsu
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.
Investigation of the Mitsunobu reaction of N-(2-hydroxyethyl)-N'- phenyl-ureas
Kim, Taek Hyeon,Lee, Gue-Jae,Cha, Mi-Hyun
, p. 2753 - 2758 (2007/10/03)
The Mitsunobu reaction of N-(2-hydroxyethyl)-ureas 1 using PPh3 and EtO2CN=NCO2Et led to the mixture of N- and O-alkylation products or a single isomer depending on the substrates.
