Building Functionalized Peptidomimetics: Use of Electroauxiliaries for Introducing N-Acyliminium Ions into Peptides
摘要:
A series of silyl-substituted amino acids have been synthesized, inserted into peptides, and then employed as precursors for oxidatively generating reactive N-acyliminium ions. Both electrochemical and chemical oxidation procedures have been employed. N-Acyliminium ion generation in a solid-phase substrate as well as application to a small library of functionalized dipeptides has been demonstrated. Limitations in terms of how electron-rich the silyl groups can be as well as the compatibility of multiple silyl groups within a longer peptide are defined.
Deprotection/reprotection of the amino group in α-amino acids and peptides. A one-pot procedure in [Bmim][BF<sub>4</sub>] ionic liquid
作者:M. L. Di Gioia、A. Barattucci、P. Bonaccorsi、A. Leggio、L. Minuti、E. Romio、A. Temperini、C. Siciliano
DOI:10.1039/c3ra46599c
日期:——
of the α-amino group in α-aminoacid and dipeptide methyl esters. [Bmim][BF4] is used as the solvent in the entire process. In particular, the use of the ionicliquid allows for rapid and clean removal of the 4-nitrobenzenesulfonyl (nosyl) group and for facile subsequent tert-butyloxycarbonylation of the free α-amino function under very mild conditions. N-Boc-α-amino acid as well as peptide derivatives
The three-component Petasis borono-Mannich reaction starting with easily accessible N-protected α-amino aldehydes produces efficiently and diastereoselectively 1,2-trans-diamines with an enantiomeric excess of up to 98%.
Synthesis of Optically Active 2,3-Disubstituted Indoline Derivatives through Cycloaddition Reactions between Benzynes and α,β-Unsaturated γ-Aminobutyronitriles
We report a method for synthesizing opticallyactive 2,3-disubstituted indolines by the cycloaddition reaction of benzynes with various 4-[(4-toluenesulfonyl)amino]-( E )-but-2-enenitriles, which are readily prepared from the corresponding l -amino acid derivatives.
我们报告了一种通过苄与各种 4-[(4-甲苯磺酰基)氨基]-( E )-but-2-enenitriles 的环加成反应合成光学活性 2,3-二取代二氢吲哚的方法,这些化合物很容易从相应的l-氨基酸衍生物。
Deprotection of<i>N</i>-Nosyl-α-amino Acids by Using Solid-Supported Mercaptoacetic Acid
作者:Rosaria De Marco、Maria Luisa Di Gioia、Antonella Leggio、Angelo Liguori、Maria Caterina Viscomi
DOI:10.1002/ejoc.200900271
日期:2009.8
has been developed. Mercaptoaceticacid was first protected by the dimethoxytrityl group and then anchored to Wang resin through an ester bond. Deprotection of the thiol function led to resin-supported mercaptoaceticacid, a useful supported thiol reagent that can be used in the polymer-assisted solution-phase removal of nosyl (Ns) groups from the amino function of α-amino acids in peptide synthesis
N-(4-Nitrophenylsulfonyl)- and N-(Fluorenylmethoxycarbonyl)-N-ethyl Amino Acid Methyl Esters - A Practical Approach
作者:Emilia Lucia Belsito、Rosaria De Marco、Maria Luisa Di Gioia、Angelo Liguori、Francesca Perri、Maria Caterina Viscomi
DOI:10.1002/ejoc.201000256
日期:2010.8
An efficient one-pot preparation of N-ethyl-N-4-nitrophenylsulfonyl (nosyl) aminoacid methyl esters was accomplished by a simple N-ethylation reaction by using triethyloxonium tetrafluoroborate in the presence of N,N-diisopropylethylamine. The N-ethylated aminoacid methyl esters are obtained with total retention of stereochemistry at the original chiral centers. To further broaden the scope of this