Dehydroamino acid (Dhaa) is recognized as a useful tool or substrate for amino acid and peptide research. Although the stereoselective synthesis of the thermodynamically more stable Z-Dhaa has been well examined and established, the stereoselective synthesis of E-Dhaa has still remained to be a challenging synthetic task. In this paper, a stereoselective synthesis of E-Dhaa esters using a new (α-d
脱氢氨基酸 (Dhaa) 被认为是氨基酸和肽研究的有用工具或底物。尽管热力学上更稳定的 Z-Dhaa 的立体选择性合成已得到充分研究和确立,但 E-Dhaa 的立体选择性合成仍然是一项具有挑战性的合成任务。在本文中,描述了使用新的(α-二苯基膦酰基)甘氨酸立体选择性合成 E-Dhaa 酯。新方法的特征方面总结如下:(i)金属添加剂在促进 E 立体选择性方面起着重要作用。(ii) NaI 用于合成带有芳基取代基和氨基官能团的 E-Dhaas,
Dehydrooligopeptides. XII. Convenient synthesis of various kinds of N-benzyloxycarbonyl-.ALPHA.-dehydroamino acid methyl esters.
Various N-benzyloxycarbonyl-α-dehydroamino acid methyl esters were newly synthesized by the condensation of α-oxocarboxylic acids with benzyl carbomate followed by methyl esterfication. Others were obtained by the Wittig-Horner reaction of aldehydes with diethoxyphosphinylglycine and by the base-catalyzed β-elimination of β-acetoxy or β-halo-α-amino acids.
[EN] NOVEL LACTAMS AND USES THEREOF<br/>[FR] NOUVELLES LACTAMES ET UTILISATIONS DE CES DERNIERES
申请人:ASTRAZENECA AB
公开号:WO2004031154A1
公开(公告)日:2004-04-15
Compounds having the formula (I) pharmaceutical compositions containing them and their methods of use for the treatment of neurological disorders related to amyloid ß protein production and neurological disorders such as Alzheimer's disease.. These compounds inhibit γ secretase and thereby inhibit the production of amyloid ß protein, thereby acting to prevent the formation of neurological deposits of amyloid protein.
Silver-Promoted Direct Phosphorylation of Bulky C(sp<sup>2</sup>)–H Bond to Build Fully Substituted β-Phosphonodehydroamino Acids
作者:Hao-Qiang Cao、Hao-Nan Liu、Zhe-Yuan Liu、Baokun Qiao、Fa-Guang Zhang、Jun-An Ma
DOI:10.1021/acs.orglett.0c02229
日期:2020.8.21
A general and practical cross-dehydrogenative coupling protocol between readily available trisubstituted α,β-dehydro α-amino carboxylic esters and H-phosphites is described. This C(sp2)–H phosphorylation reaction proceeds with absolute Z-selectivity promoted by silver salt in a radical relay manner. The bulky tetrasubstituted β-phosphonodehydroamino acids were obtained in grams and added new modules
Application of Chiral Mixed Phosphorus/Sulfur Ligands to Enantioselective Rhodium-Catalyzed Dehydroamino Acid Hydrogenation and Ketone Hydrosilylation Processes
作者:David A. Evans、Forrest E. Michael、Jason S. Tedrow、Kevin R. Campos
DOI:10.1021/ja012639o
日期:2003.3.1
Rh-catalyzed dehydroamino acid hydrogenation and ketone hydrosilylation reactions (eqs 1, 2). After assaying the influence of the substituents at sulfur, the substituents on the ligand backbone, the relative stereochemistry within the ligand backbone, and the substituents at phosphorus, ligands 2c (R = 3,5-dimethylphenyl) and 3 were found to be optimal in the Rh-catalyzed hydrogenation of a variety of alpha-acylaminoacrylates