Enzymatic Conversion of 6-Nitroquinoline to the Fluorophore 6-Aminoquinoline Selectively under Hypoxic Conditions
作者:Anuruddha Rajapakse、Collette Linder、Ryan D. Morrison、Ujjal Sarkar、Nathan D. Leigh、Charles L. Barnes、J. Scott Daniels、Kent S. Gates
DOI:10.1021/tx300483z
日期:2013.4.15
can be efficiently converted by xanthine/xanthine oxidase to 2 only under hypoxic conditions. This finding provides evidence for multiple oxygen-sensitive steps in the enzymaticconversion of nitroaryl compounds to the corresponding amino derivatives. In a side reaction that is separate from the bioreductive metabolism of 1, xanthine oxidase converted 1 to 6-nitroquinolin-2(1H)-one (5). These studies
Preparation of <i>N</i>-Aryl Amides by Epimerization-Free Umpolung Amide Synthesis
作者:Michael S. Crocker、Zihang Deng、Jeffrey N. Johnston
DOI:10.1021/jacs.2c05986
日期:2022.9.21
enantioselective synthesis. However, its inability to forge N-aryl amides has been a longstanding problem, one limiting its application more broadly in drug development where α-chiral N-aryl amides are increasingly common. We report here the reaction of α-fluoronitroalkanes and N-aryl hydroxyl amines for the direct synthesis of N-aryl amides using a simple Brønsted base as the promoter. No other activating
synthesis of functionalized biaryls through nucleophilic aromatic substitution (SNAr) of arylhydroxylamines to arylsulfoniumsalts. With this protocol, structurally diverse functionalized biaryls were obtained smoothly in moderate to good yields. Merits of this transformation include mild reaction conditions, broad substrate scope, great functional group tolerance, feasibility of a one-pot procedure, and
我们报告了一种无过渡金属方案,用于通过芳基羟胺到芳基锍盐的亲核芳族取代 (S N Ar) 合成功能化联芳基化合物。使用该协议,结构多样的功能化联芳基以中等至良好的产量顺利获得。这种转化的优点包括反应条件温和、底物范围广、官能团耐受性好、一锅法的可行性以及易于处理和放大。
[DE] VERFAHREN ZUR HERSTELLUNG ORGANISCHER HYDROXYLAMINE<br/>[EN] METHOD FOR PRODUCING ORGANIC HYDROXYLAMINES<br/>[FR] PROCEDE POUR PRODUIRE DES HYDROXYLAMINES ORGANIQUES
申请人:CONSORTIUM FÜR ELEKTROCHEMISCHE INDUSTRIE GMBH
公开号:WO1999028289A1
公开(公告)日:1999-06-10
(DE) Die Erfindung betrifft ein Verfahren zur Herstellung von organischen Hydroxylaminen, bei dem mindestens eine organische Nitroverbindung in Anwesenheit einer organischen Base oder Ammoniak, einer dreiwertigen Phosphorverbindung und eines Hydrierkatalysators partiell hydriert wird, dadurch gekennzeichnet, daß die Stickstoffbase in Mengen größer 10 Gew. % bezogen auf die organische Nitroverbindung eingesetzt wird.(EN) According to the inventive method for producing organic hydroxylamines, at least one organic nitro compound is partially hydrogenated in the presence of an organic base or ammonia, a trivalent phosphor compound and a hydrogenation catalyst. The invention is characterised in that quantities of the nitrogen base of more than 10 wt. % in relation to the organic nitro compound are used.(FR) L'invention concerne un procédé pour la production d'hydroxylamines organiques, dans lequel au moins un composé nitro organique est hydrogéné partiellement en présence d'une base organique ou d'ammoniac, d'une composé phosphoré trivalent et d'un catalyseur d'hydrogénation. L'invention est caractérisée en ce que la base azotée est utilisée en quantités supérieures à 10 % en poids par rapport au composé nitro organique.
AbstractA metal‐ and oxidant‐free, practical and efficient method for the synthesis of highly versatile and synthetically useful ortho‐trifluoromethanesulfonylated anilines from arylhydroxylamines and trifluoromethanesulfinic chloride was developed. This rapid transformation proceeded smoothly with good yields and excellent ortho‐selectivity in the absence of any metals or ligands. Mechanistically, the reaction comprised a noncanonical O‐trifluoromethanesulfinylation of the arylhydroxylamine, and the subsequent [2,3]‐sigmatropic rearrangement to afford ortho‐trifluoromethanesulfonylated aniline derivatives. The practical application of this reaction was demonstrated by further conversion into a series of functional molecules under different reaction conditions.