The Synthesis of Novel Chiral Cholic Acid-Based Molecular Clefts Containing Unsymmetrically Disubstituted Urea Unit
作者:Qi Ming Mu、Cui Hua Xue、Qing Hua Zhang、Shu Hua Chen
DOI:10.1081/scc-120022481
日期:2003.9.1
Abstract A novel type of chiralmolecularclefts 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 spectra, and Elemental analysis.
Investigation of the Mitsunobu Reaction of<i>N</i>-(2-Hydroxyethyl)-<i>N′</i>-Phenyl-Ureas
作者:Taek Hyeon Kim、Gue-Jae Lee、Mi-Hyun Cha
DOI:10.1080/00397919908086441
日期:1999.8
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.