Bio- and Medicinally Compatible α-Amino-Acid Modification via Merging Photoredox and N-Heterocyclic Carbene Catalysis
摘要:
An N-heterocyclic carbene and photoredox cocatalyzed alpha-amino-acid decarboxylative carbonylation reaction is presented. This method displays good scope generality, providing a direct pathway to access various downstream alpha-amino ketones under bio- and medicinally compatible conditions. Moreover, this strategy is appealing to chemical biology because it has great potential for the chemical modification of peptides or the late-stage synthesis of keto-peptides.
[EN] AN IMPROVED PROCESS FOR THE PREPARATION OF LACOSAMIDE<br/>[FR] PROCÉDÉ AMÉLIORÉ DE PRÉPARATION DE LACOSAMIDE
申请人:UNICHEM LAB LTD
公开号:WO2018060781A1
公开(公告)日:2018-04-05
The present invention relates to an improved process for the synthesis of (R)- Lacosamide in which free base of O-methyl-N-benzyl-D-Serinamide is not isolated before acylation. The process avoids the use of column chromatography and chiral resolution for the preparation of different stages of Lacosamide.
Oxidative damage of proline residues by nitrate radicals (NO<sub>3</sub>˙): a kinetic and product study
作者:Joses G. Nathanael、Jonathan M. White、Annika Richter、Madison R. Nuske、Uta Wille
DOI:10.1039/d0ob01337d
日期:——
indicating that NO3˙-induced oxidation of amide bonds proceeds through initial formation of a charge transfer complex. Furthermore, the rate of oxidative damage of proline and N-methyl glycine is significantly influenced by its position in a peptide. Thus, neighbouring peptide bonds, particularly in the N-direction, reduce the electron density at the tertiary amide, which slows down the rate of ET by up
叔酰胺,例如N-酰化脯氨酸或N-甲基甘氨酸残基,与硝酸根 (NO 3 ˙) 快速反应,在乙腈中的绝对速率系数范围为 4-7 × 10 8 M -1 s -1 。主要途径通过氮处的氧化电子转移 (ET) 进行,而在这些条件下,夺氢只是次要因素。然而,酰胺的空间位阻,例如α-碳上的烷基侧链,使速率系数降低高达 75%,表明 NO 3˙ 诱导的酰胺键氧化通过电荷转移复合物的初始形成进行。此外,脯氨酸和N-甲基甘氨酸的氧化损伤率显着受其在肽中的位置的影响。因此,相邻的肽键,特别是在N方向上,会降低叔酰胺的电子密度,从而将 ET 的速率降低多达一个数量级。这些模型研究的结果表明,与单一氨基酸相比,肽中脯氨酸残基对自由基诱导的氧化损伤的敏感性应大大降低。
Total Synthesis of the Peptaibols<i>Hypomurocin A3</i>and<i>Hypomurocin A5</i>, and Their Conformation Analysis
in solution phase are described. These syntheses have been successfully achieved by applying the 'azirine/oxazolone method' to introduce the two Aib-Pro units into the backbone of these undecapeptaibols in one step with methyl 2,2-dimethyl-2H-azirine-3-prolinate as the 'Aib-Prosynthon'. The coupling of Z-protected (Z=(benzyloxy)carbonyl) amino acids or peptide acids with amino acid tert-butyl esters
[EN] FURO[3,2-B]PYRIDINE COMPOUNDS USEFUL AS INHIBITORS OF THE PAR-2 SIGNALING PATHWAY<br/>[FR] COMPOSÉS FURO[3,2-B]PYRIDINE UTILES EN TANT QU'INHIBITEURS DE LA VOIE DE SIGNALISATION PAR-2
申请人:VERTEX PHARMA
公开号:WO2018057588A1
公开(公告)日:2018-03-29
Disclosed are chemical entities which are compounds of Formula (I): (I) and pharmaceutically acceptable salts thereof, wherein A, R1, R2, E, n and Z are as defined herein. These chemical entities are useful as inhibitors of the PAR-2 signaling pathway. These chemical entities and pharmaceutically acceptable compositions comprising such chemical entities can be employed for treating various diseases, disorders, and conditions.
Immune-stimulating and cancerostatic 1-acyl-2-cyanoaziridines
申请人:Boehringer Mannheim, GmbH
公开号:US04267174A1
公开(公告)日:1981-05-12
1-Acyl-2-cyanoaziridines of the formula ##STR1## wherein R is an acyl radical of a carboxylic, sulphonic, sulphinic, sulphenic, phosphonic or phosphoric acid, exhibit immune-stimulating and cancerostatic activities.