Participation of host ‘spacer’ atoms in carboxylic acid binding: implications for amino acid recognition
摘要:
Chiral 4,4'-diamidao-2,2'-biimidazoles were synthesized and found to bind N-Boc protected amino acids in CDCl3. The biinmidazole that features (R)-tetrahydrofurfuryl units discriminates between N-Boc-L-Ser (K-assoc 120 M-1) and its non-natural D-enantiomer (270 M-1). X-ray diffraction and computational analyses show that members of this receptor class adopt a cleft-like conformation, presenting a donor-spacer-donor-acceptor H-bonding array. Complexes of such biimidazoles with the COOH unit of amino acids are stabilized by direct involvement of what is nominally a 'spacer' atom. unlike other D-Sp-D-A hosts, (c) 2005 Elsevier Ltd. All rights reserved.
Participation of host ‘spacer’ atoms in carboxylic acid binding: implications for amino acid recognition
摘要:
Chiral 4,4'-diamidao-2,2'-biimidazoles were synthesized and found to bind N-Boc protected amino acids in CDCl3. The biinmidazole that features (R)-tetrahydrofurfuryl units discriminates between N-Boc-L-Ser (K-assoc 120 M-1) and its non-natural D-enantiomer (270 M-1). X-ray diffraction and computational analyses show that members of this receptor class adopt a cleft-like conformation, presenting a donor-spacer-donor-acceptor H-bonding array. Complexes of such biimidazoles with the COOH unit of amino acids are stabilized by direct involvement of what is nominally a 'spacer' atom. unlike other D-Sp-D-A hosts, (c) 2005 Elsevier Ltd. All rights reserved.
Participation of host ‘spacer’ atoms in carboxylic acid binding: implications for amino acid recognition
作者:Daniel K. Barnhill、Andrew L. Sargent、William E. Allen
DOI:10.1016/j.tet.2005.06.096
日期:2005.8
Chiral 4,4'-diamidao-2,2'-biimidazoles were synthesized and found to bind N-Boc protected amino acids in CDCl3. The biinmidazole that features (R)-tetrahydrofurfuryl units discriminates between N-Boc-L-Ser (K-assoc 120 M-1) and its non-natural D-enantiomer (270 M-1). X-ray diffraction and computational analyses show that members of this receptor class adopt a cleft-like conformation, presenting a donor-spacer-donor-acceptor H-bonding array. Complexes of such biimidazoles with the COOH unit of amino acids are stabilized by direct involvement of what is nominally a 'spacer' atom. unlike other D-Sp-D-A hosts, (c) 2005 Elsevier Ltd. All rights reserved.