脲基肽和源自 α,α-二肽 C 末端甘氨酸的中间体的微波辅助合成、光谱学、晶体结构、表征和赫什菲尔德表面分析
摘要:
本文描述了通过微波辐射作用对原始肽循环进行合成有用的分解代谢途径激活,从而产生了一种新的肽衍生物:α,α-脲肽,作为通过乙内酰脲的 1,3-二取代不对称脲,从N Cbz开始含有甘氨酸作为C端残基的受保护 α,α-二肽甲酯。合成了新的脲基肽系列,并通过 FT-IR、MS、1 H NMR、13 C NMR 光谱和单晶 X 射线衍射分析进行了结构表征。Phe-Gly-脲肽3h的分子结构和晶体堆积,命名为 C 12 H 14 N 2 O 5,处于单斜晶系和C2/c空间群,参数a = 32.42 Å,b = 9.62 Å,c = 8.40 Å,β =103.25°,且Z = 8,Z' =1,确认对新化合物评估的分配。该程序已扩展到 α,α-脲肽中间体乙内酰脲 Leu-Gly 4e , C 9 H 14 N 2 O 4的分离,证明了合成机理并在斜方晶系、Pbca空间群中结晶,参数如下a = 5
Hydantoin-Free Synthesis of Peptide Ester Isocyanates, Isothiocyanates, and Dipeptidyl Ureas: The Application of Zinc Dust in a Carbonylation Procedure without Base
作者:Vommina Sureshbabu、N. Narendra、T. Vishwanatha
DOI:10.1055/s-0030-1260216
日期:2011.10
Non-Schotten-Baumann conditions are described for the hydantoin-free synthesis of peptide ester isocyanates using activated zinc dust as a non-basic HCl scavenger. Also, the procedure gives no N-acylated products in the case of the conversion of amino acid and peptide amides into isocyanates.
Recyclable Hypervalent Iodine(III) Reagent Iodosodilactone as an Efficient Coupling Reagent for Direct Esterification, Amidation, and Peptide Coupling
作者:Jun Tian、Wen-Chao Gao、Dong-Mei Zhou、Chi Zhang
DOI:10.1021/ol301085v
日期:2012.6.15
hypervalent iodine(III) reagent plays a novel role as an efficient coupling reagent to promote the direct condensation between carboxylicacids and alcohols or amines to provide esters, macrocyclic lactones, amides, as well as peptides without racemization. The regeneration of iodosodilactone (1) can also be readily achieved. The intermediate acyloxyphosphonium ion C from the activation of a carboxylic acid
that of the l-l, and similar differences have been found with several pairs of diastereoisomeric di- and-tri-peptides. A preliminary discussion of these results in terms of preferred conformations of peptide chains is given.
Kinetics of the alkaline hydrolysis of several n-benzyloxycarbonyldipeptide methyl and ethyl esters
作者:D.A. Hoogwater、M. Peereboom
DOI:10.1016/s0040-4020(01)87839-x
日期:1990.1
The reaction rates of the alkalinehydrolysis of synthesized -protected dipeptide methyl and ethyl esters were studied systematically. From the kinetic data the energies of activation, the pre-exponential factors and the reference values at 40°C were calculated. The rate of hydrolysis shows to be strongly dependent on the C-terminal amino acid in the sequence Gly ⪢ Ala/Met/Phe ⪢ Leu ⪢ Val/Pro. Surprisingly
系统地研究了合成保护的二肽甲酯和乙酯的碱水解反应速率。从动力学数据计算出活化能,指数前因子和40°C时的参考值。水解速率显示出强烈依赖于序列Gly⪢Ala / Met / Phe⪢Leu⪢Val / Pro的C末端氨基酸。令人惊讶地,N-末端氨基酸也发挥作用,但是顺序不同。N端苯丙氨酸尤其显示出相对加速作用。值得注意的是,与相应的甲酯/甲醇/水相比,乙醇/水中的含甘氨酸的二肽乙酯的酯水解明显更快。
Synthesis of two heptapeptides corresponding to sequences 50-56 and 90-96 of adrenodoxin from bovine adrenal cortex and formation of their iron-sulfur complexes.
Two heptapeptides, Z-Leu-Ala-Cys (Bzl)-Ser-Thr-Cys (Bzl)-His-OH (A) and Z-Leu-Gly-Cys (Bzl)-Gln-Ile-Cys (Bzl)-Leu-OH (B), corresponding to sequences 50-56 and 90-96 of adrenodoxin from bovine adrenal cortex, respectively, were synthesized. The deblocked peptides from A and B formed iron-sulfur complexes, both of which gave absorption maxima at 415 nm.