A novel thermo-responsive multiblock architecture composed of a sequential peptide and an amino acid-derived vinyl polymer: toward protein-mimicking single-chain folding
The photoinduced electron transfer (PET) promoted decarboxylative radical additions of carboxylic acids using N-acryloyl amino acid esters and peptides as radicalacceptors smoothly afforded the corresponding modified amino acids and peptides under mild reaction conditions. The radical additions of α-amino acids led to the formation of γ- and α-dipeptide, and peptides underwent peptide coupling via
SmI<sub>2</sub>-Promoted Radical Addition of Nitrones to α,β-Unsaturated Amides and Esters: Synthesis of γ-Amino Acids via a Nitrogen Equivalent to the Ketyl Radical
作者:Ditte Riber、Troels Skrydstrup
DOI:10.1021/ol027386y
日期:2003.1.1
[reaction: see text] Alkyl nitrones undergo radical addition reactions to a series of alpha,beta-unsaturated amides and esters when subjected to samarium diiodide via a nitrogen equivalent to a ketyl radical anion. This reaction conveniently provides access to a variety of functionalized gamma-amino acids. The methodology was extended to the asymmetric synthesis of 4-substituted gamma-amino acids,
Synthesis of novel hyperbranched poly(ester-amide)s based on neutral α-amino acids via “AD + CBB′” couple-monomer approach
作者:You-Mei Bao、Xiao-Hui Liu、Xiu-Lan Tang、Yue-Sheng Li
DOI:10.1002/pola.24340
日期:2010.12.1
A series of novelhyperbranchedpoly(ester‐amide)s (HBPEAs) based on neutral α‐amino acids have been synthesized via the “AD + CBB′” couple‐monomer approach. The ABB′ intermediates were stoichiometrically formed through thio‐Michael addition reaction because of reactivity differences between functional groups. Without any purification, in situ self‐polycondensations of the intermediates at elevated
通过“ AD + CBB'”偶合单体方法合成了一系列基于中性α-氨基酸的新型超支化聚(酯酰胺)(HBPEAs)。由于官能团之间的反应性差异,通过硫代-迈克尔加成反应以化学计量方式形成了ABB'中间体。无需任何纯化,中间体在催化剂存在下于高温下进行原位自缩聚反应,可得到具有多羟基端基的HBPEA。定量13估计HBPEA的分支度(DBs)为0.40–0.58和0.24–0.54取决于聚合条件和单体结构,分别采用两种不同的计算方法进行13 C NMR。研究了催化剂,温度和中间结构对聚合过程和分子量以及所得聚合物性能的影响。FTIR,NMR和DEPT-135 NMR分析显示了所得聚合物的支链结构。HBPEA具有中等分子量,分布范围广,玻璃化转变温度在-25.5至36.5°C范围内,在氮气和空气下失重10%时的分解温度在243.4–289.1°C和231.4–265.6范围内分别为℃。其中,那些衍生
Process for producing optically active beta-amino acid derivatives
申请人:Sodeoka Mikiko
公开号:US20060205968A1
公开(公告)日:2006-09-14
The present invention is to provide a method for producing the desired optically active β-amino acid derivatives of high optical purities in high yields, without requiring a step of deprotection. More particularly, the present invention relates to a method for producing an optically active β-amino acid derivative or a salt thereof represented by the formula (2):
which comprises reacting an α,β-unsaturated carboxylic acid derivative or a salt thereof represented by the formula (1):
with an amines or a salt thereof in the presence of a chiral catalyst and in the presence or absence of an acid.
Cyrene: a bio-based solvent for the Mizoroki–Heck reaction of aryl iodides
作者:Naya A. Stini、Petros L. Gkizis、Christoforos G. Kokotos
DOI:10.1039/d2ob02012b
日期:——
widely used organic reactions. Cyrene has appeared to be an excellent alternative solvent for a number of organic reactions. In this work, the development of a new, greener and more economical protocol for the Mizoroki–Heck reaction is described, using Cyrene as the green solvent and Pd/C as the palladium catalyst source. A wide substrate scope for the coupling of aryl iodides with acrylamides, acrylates
开发更绿色和更可持续的方法,以及使现有协议适应更环保的程序,已成为有机合成的关键。引入和利用更环保的溶剂是一种非常有前途的替代品,特别是当它们可以在已知和广泛使用的有机反应中替代有毒有机溶剂时。Cyrene 似乎是许多有机反应的极佳替代溶剂。在这项工作中,描述了一种新的、更环保、更经济的 Mizoroki–Heck 反应方案的开发,使用 Cyrene 作为绿色溶剂,Pd/C 作为钯催化剂源。展示了芳基碘与丙烯酰胺、丙烯酸酯、丙烯酸、丙烯腈和苯乙烯偶联的广泛底物范围。Cyrene 的可回收性和最终产品中钯的浸出进行了检查,以提高该协议的工业适用性。此外,还报道了天然产物哌洛汀 A 的合成。