Triurea Derivatives of Diethylenetriamine as Potential Templates for the Formation of Artificial β-Sheets1
摘要:
This paper describes synthetic and structural studies of triurea derivatives of an N,N ''-disubstituted diethylenetriamine. Diethylenetriamine triureas 1 (PhN(CONHR(1))CH2CH2N(CONHR(2))CH2CH2N(CONHR(3))CH2CH2CN; 2a, R(1) = R(2) = R(3) = Ph; 2b, R(1) = R(2) = R(3) = CH3; 2c, R(1) = (S)-CH(CH(2)Ph)CO2CH3 R(2) = (S)-CH(i-Pr)CO2CH3, R(3) = (S)-CH((S)-s-Bu)CO2CH3)) are efficiently prepared in five or six steps from N-phenylethylenediamine. Infrared spectroscopy, H-1 NMR spectroscopy, and X-ray crystallography indicate that triureas 1 adopt intramolecularly hydrogen-bonded conformations, both in chloroform solution and in the solid state. The three urea groups form a hydrogen-bonded network: The carbonyl group of urea NCONHR(1) is hydrogen bonded to the NH group of urea NCONHR(2), and the carbonyl group of urea NCONHR(2) is hydrogen bonded to the NH group of urea NCONHR(3). The three R groups are aligned along the triurea backbone, pointing in roughly the same direction, like three fingers on a hand. Molecular modeling suggests that the triurea backbone will be a suitable template for the creation of artificial beta-sheets. When molecular mechanics energy minimization calculations are performed upon a triurea bearing three N-terminally linked peptide strands, a parallel beta-sheet is formed.
作者:James S Nowick、Eric M Smith、Joseph W Ziller、A.J Shaka
DOI:10.1016/s0040-4020(01)01092-4
日期:2002.1
of compounds, comprisingmolecular templates and attached peptide strands, that mimic a small three-stranded mixed β-sheet (6a and b). Each of these artificial β-sheets is composed of two different molecular templates and two dipeptide strands. One of the templates is based on a 5-amino-2-methoxybenzoic hydrazide group that mimics the hydrogen-bonding functionality of a peptideβ-strand and serves as
solid-phase syntheses of artificial β-sheets 1−4, which mimic the structure and hydrogen-bonding patterns of protein β-sheets. In these compounds, molecular templates induce β-sheet structures in attached peptide strands. The templates consist of di- and triurea derivatives, which hold peptide and peptidomimetic strands in proximity, and β-strandmimics, which hydrogen bond to the peptide strands. The syntheses
Triurea Derivatives of Diethylenetriamine as Potential Templates for the Formation of Artificial β-Sheets<sup>1</sup>
作者:James S. Nowick、Sami Mahrus、Eric M. Smith、Joseph W. Ziller
DOI:10.1021/ja9536072
日期:1996.1.1
This paper describes synthetic and structural studies of triurea derivatives of an N,N ''-disubstituted diethylenetriamine. Diethylenetriamine triureas 1 (PhN(CONHR(1))CH2CH2N(CONHR(2))CH2CH2N(CONHR(3))CH2CH2CN; 2a, R(1) = R(2) = R(3) = Ph; 2b, R(1) = R(2) = R(3) = CH3; 2c, R(1) = (S)-CH(CH(2)Ph)CO2CH3 R(2) = (S)-CH(i-Pr)CO2CH3, R(3) = (S)-CH((S)-s-Bu)CO2CH3)) are efficiently prepared in five or six steps from N-phenylethylenediamine. Infrared spectroscopy, H-1 NMR spectroscopy, and X-ray crystallography indicate that triureas 1 adopt intramolecularly hydrogen-bonded conformations, both in chloroform solution and in the solid state. The three urea groups form a hydrogen-bonded network: The carbonyl group of urea NCONHR(1) is hydrogen bonded to the NH group of urea NCONHR(2), and the carbonyl group of urea NCONHR(2) is hydrogen bonded to the NH group of urea NCONHR(3). The three R groups are aligned along the triurea backbone, pointing in roughly the same direction, like three fingers on a hand. Molecular modeling suggests that the triurea backbone will be a suitable template for the creation of artificial beta-sheets. When molecular mechanics energy minimization calculations are performed upon a triurea bearing three N-terminally linked peptide strands, a parallel beta-sheet is formed.