N-Acyl-l-phenylalanine derivatives as potent VLA-4 antagonists that mimic a cyclic peptide conformation
摘要:
A series of N-benzylpyroglutamyl-L-phenylalanine derivatives bearing carbamoyl substituents in the 3- or 4-positions was prepared and assayed for inhibition of the interaction between VCAM and VLA-4. Potent inhibition was observed in a number of analogues with substitution in the 4-position favored over the 3-position. A crystal structure of the key intermediate 25 indicates that it accesses a low energy conformation which closely matches key pharmacophores of a structurally characterized cyclic peptide. (C) 2002 Elsevier Science Ltd. All rights reserved.
硫 ( VI ) 氟化物交换 (SuFEx) 化学已成为下一代点击反应,旨在快速、模块化地组装功能分子。在这里,我们报告了在两室系统中异位生成三氟甲磺酰氟(CF 3 SO 2 F)气体,并将其用作新的SuFEx手柄来有效合成三氟甲磺酸酯和三氟甲酰胺。这种广泛耐受的方案适用于肽修饰或伸缩到偶联反应中。此外,重新设计带有 S 的 S VI –F 连接器 奥 → 南 NR 取代提供了类似的三氟甲酰亚胺氟化物作为 SuFEx 亲电子试剂,其参与了罕见报道的三氟甲亚胺酯的合成。值得注意的是,实验表明 H 2 O 是实现苯酚与胺基化学选择性三氟甲磺化的关键,这一现象可以通过从头算动力学模拟通过胺的 CF 3 SO 2 F 三氟甲磺酸基化的氢键分子过渡态得到最好的解释。
Pd(II)-Catalyzed Amination of C−H Bonds Using Single-Electron or Two-electron Oxidants
作者:Tian-Sheng Mei、Xisheng Wang、Jin-Quan Yu
DOI:10.1021/ja904709b
日期:2009.8.12
Pd(II)-catalyzed intramolecular amination of arenes is developed using either a one- or two-electron oxidant. The reaction protocol tolerates a wide range of deactivating groups including acetyl, cyano, and nitro groups. This catalytic reaction allows expedient syntheses of broadly useful substituted indolines or indoles.
A Mild Synthesis of Aryl Triflates Enabling the Late‐Stage Modification of Drug Analogs and Complex Peptides
作者:Stefan Schiesser、Joanna Ceklarz、Johanna Kollback、Lucie Borowiec、Julia Fagerlund、Shakiba Vahdat、Marika Lindhagen、Okky Dwichandra Putra
DOI:10.1002/chem.202301421
日期:2023.7.26
triflates using a newly discovered reagent in presence of a fluoride source. The reactions are generally complete within a few minutes at room temperature. The mild conditions allow the late-stage O-triflation of complex peptides bearing challenging side chains like arginine and histidine. We show that aryl triflates can be an interesting moiety for medicinal chemistry.
Provided are sulfonamide derivatives of a specific chemical structure in which a sulfonamide group having, as a substituent, a phenyl group or a heterocyclic group having a hetero atom(s) as a constituent element(s) is present at its terminal, and pharmaceutically acceptable salts thereof. These compounds are novel compounds having excellent α4 integrin-inhibitory action.
Pd(II)-Catalyzed <i>o</i>-C−H Acetoxylation of Phenylalanine and Ephedrine Derivatives with MeCOOO<sup><i>t</i></sup>Bu/Ac<sub>2</sub>O
作者:Chris J. Vickers、Tian-Sheng Mei、Jin-Quan Yu
DOI:10.1021/ol1007108
日期:2010.6.4
Pd(II)-catalyzed ortho C-H acetoxylation of triflate protected phenethyl- and phenpropylamines has been achieved with tert-butyl peroxyacetate as the stoichiometric oxidant and either DMF or CH3CN as the promoter. The reaction was found to tolerate a large variety of functional groups and could be combined with subsequent intramolecular amination to afford functionalized indoline derivatives.
[EN] SULFONAMIDE DERIVATIVE AND MEDICINAL USE THEREOF<br/>[FR] DÉRIVÉ DE SULFONAMIDE ET UTILISATION MÉDICALE ASSOCIÉE