Enantioselective Transport by a Steroidal Guanidinium Receptor
摘要:
The cationic steroidal receptors 9 and 11 have been synthesized from cholic acid 3. Receptor 9 extracts N-acetyl-alpha-amino acids from aqueous media into chloroform with enantioselectivities (L:D) of 7-10:1. The lipophilic variant 11 has been employed for the enantioselective transport of N-acetylphenylalanine, a) through dichloromethane (DCM) and dichloroethane (DCE) bulk liquid membranes (U-tube apparatus), and b) through 2.5% (v/v) octanol/hexane via hollow fibre membrane contactors. Significant enantioselectivities and multiple turnovers were observed for both types of apparatus.
Enantioselective Transport by a Steroidal Guanidinium Receptor
作者:Beatriz Baragaña、Adrian G. Blackburn、Perla Breccia、Anthony P. Davis、Javier de Mendoza、José M. Padrón-Carrillo、Pilar Prados、Jens Riedner、Johannes G. de Vries
The cationic steroidal receptors 9 and 11 have been synthesized from cholic acid 3. Receptor 9 extracts N-acetyl-alpha-amino acids from aqueous media into chloroform with enantioselectivities (L:D) of 7-10:1. The lipophilic variant 11 has been employed for the enantioselective transport of N-acetylphenylalanine, a) through dichloromethane (DCM) and dichloroethane (DCE) bulk liquid membranes (U-tube apparatus), and b) through 2.5% (v/v) octanol/hexane via hollow fibre membrane contactors. Significant enantioselectivities and multiple turnovers were observed for both types of apparatus.
Steroidal guanidines as enantioselective receptors for N-acyl α-amino acids. Part 1. 3α-Guanylated carbamates derived from cholic acid
作者:Laurence J. Lawless、Adrian G. Blackburn、Alan J. Ayling、M. Nieves Pérez-Payán、Anthony P. Davis
DOI:10.1039/b009215k
日期:——
other functional groups, were synthesized from cholic acid1. These cations were shown to extract chiral carboxylate anions from aqueous buffer into chloroform with significant enantioselectivities. The most successful receptors bore two carbamate substituents and achieved, in the best cases, ratios (L:D) of 7–10:1 for a series of five N-acetyl α-amino acids.