Discovery of CGS 27023A, a Non-Peptidic, Potent, and Orally Active Stromelysin Inhibitor That Blocks Cartilage Degradation in Rabbits
摘要:
Structure-activity relationships of a lead hydroxamic acid inhibitor of recombinant human stromelysin were systematically defined by taking advantage of a concise synthesis that allowed diverse functionality to be explored at each position in a template. An ex vivo rat model and an in vivo rabbit model of stromelysin-induced cartilage degradation were used to further optimize these analogs for oral activity and duration of action. The culmination of these modifications resulted in CGS 27023A, a potent, orally active stromelysin inhibitor that blocks the erosion of cartilage matrix.
Iron-Catalyzed Hydroamination and Hydroetherification of Unactivated Alkenes
作者:Paul T. Marcyk、Silas P. Cook
DOI:10.1021/acs.orglett.9b00427
日期:2019.3.1
The hydrofunctionalization of alkenes, explored for over 100 years, offers the potential for a direct, atom-economical approach to value-added products. While thermodynamically favored, the kinetic barrier to such processes necessitates the use of catalysts to control selectivity and reactivity. Modern variants typically rely on noble metals that require different ligands for each class of hydrofunctionalization
Phosphine/Photoredox Catalyzed Anti-Markovnikov Hydroamination of Olefins with Primary Sulfonamides via α-Scission from Phosphoranyl Radicals
作者:Alex J. Chinn、Kassandra Sedillo、Abigail G. Doyle
DOI:10.1021/jacs.1c09484
日期:2021.11.3
well-explored β-scission chemistry of phosphoranyl radicals, this strategy is applicable to activation of N-based nucleophiles and is catalytic in phosphine. We highlight application of this activation strategy to an intermolecular anti-Markovnikov hydroamination of unactivatedolefins with primary sulfonamides. A range of structurally diverse secondary sulfonamides can be prepared in good to excellent yields
从普通原料化学品中获取自由基的新策略具有广泛影响合成化学的潜力。我们报告了一种双膦和光氧化还原催化系统,该系统能够从伯磺酰胺中直接形成磺胺基自由基。机理研究支持 N 中心自由基是通过磷酰基自由基中间体的 P-N 键的 α 断裂产生的,该中间体由磺酰胺亲核加成到膦自由基阳离子形成。与最近充分探索的磷酰基自由基的 β- 断裂化学相比,该策略适用于 N 基亲核试剂的活化,并且在膦中具有催化作用。我们重点介绍了这种活化策略在未活化烯烃与伯磺酰胺的分子间抗马尔科夫尼科夫加氢胺化中的应用。
Photoredox-Mediated Mono- and Difluorination of Remote Unactivated Methylene C(sp<sup>3</sup>)–H Bonds of <i>N</i>-Alkyl Sulfonamides
作者:Zhiqiang Deng、Zhenxiang Zhao、Gang He、Gong Chen
DOI:10.1021/acs.orglett.1c01020
日期:2021.5.7
A photoredox-mediated δ-C(sp3)–H fluorination of sulfonyl-protected primary alkylamines with Selectfluor is developed. The reaction can proceed in excellent monofluorination selectivity for amine substrates without α substituent. For α-substituted substrates, a slightly modified reaction conditions with two rounds of operation gives the δ,δ-difluorination products in good yield. Mechanistic studies
Sulfonamide Synthesis through Electrochemical Oxidative Coupling of Amines and Thiols
作者:Gabriele Laudadio、Efstathios Barmpoutsis、Christiane Schotten、Lisa Struik、Sebastian Govaerts、Duncan L. Browne、Timothy Noël
DOI:10.1021/jacs.9b02266
日期:2019.4.10
continuous development of novel and efficient synthetic methods to access these functional groups. Herein, we report an environmentally benign electrochemical method which enables the oxidative coupling between thiols and amines, two readily available and inexpensive commodity chemicals. The transformation is completely driven by electricity, does not require any sacrificial reagent or additional catalysts