Pseudopeptide fragments and local structures induced by an α-aminoxy acid in a dipeptide
摘要:
An alpha-aminoxy acid residue has been introduced by liquid-phase procedures in a model dipeptide, by means of the amidoxy (CO-NH-O), oxime (CH=N-O) and hydroxylamine (CH2-NH-O) pseudopeptide link. The structural properties induced by the three amide surrogates, which are not protonated at the physiological pH, have been studied in organic solution. In all three cases, the oc-oxygen interacts with the adjacent amide NH to close a five-membered cycle. The amidoxy link gives rise to a very stable bt-like folded structure and the cis-oxime link to a beta-like folded structure. (C) 2000 Elsevier Science Ltd. All rights reserved.
Pseudopeptide fragments and local structures induced by an α-aminoxy acid in a dipeptide
摘要:
An alpha-aminoxy acid residue has been introduced by liquid-phase procedures in a model dipeptide, by means of the amidoxy (CO-NH-O), oxime (CH=N-O) and hydroxylamine (CH2-NH-O) pseudopeptide link. The structural properties induced by the three amide surrogates, which are not protonated at the physiological pH, have been studied in organic solution. In all three cases, the oc-oxygen interacts with the adjacent amide NH to close a five-membered cycle. The amidoxy link gives rise to a very stable bt-like folded structure and the cis-oxime link to a beta-like folded structure. (C) 2000 Elsevier Science Ltd. All rights reserved.