由取代的N-甲基苯胺制备喹啉环上具有不同取代基的各种11-氯-5-甲基-5 H-吲哚并[2,3- b ]喹啉(新隐油松),它们是抗疟疾药物的关键中间体,可通过以下方法容易地获得苯胺的N-甲基化,以及吲哚-3-羧酸盐的对应物。与使用苯胺的已知方法相比,该方案在减少到达目标的步骤数方面是良性的,并且产品易于纯化。或者,他们的6-甲基同源物由N制备2-芳基氨基吲哚-3-羧酸吲哚部分的甲基化,然后连续环化和氯化。在C11位置的亲核取代反应中,发现11-Chloroneocryptolepines比其6-甲基同类物更具反应性。
phenylenediamine derivatives, the electrochemical properties of the labeling agent can be drastically changed. On the other hand, horseradish peroxidase (HRP) also catalyzes the reaction with almost the same oxidation potential as Ru(bpy)32+ (∼+1.1 V). HRP proximity labeling is applicable to signal amplification in immunohistochemistry. We evaluated the phenylenediamine derivatives as labeling agents
Reported herein is the one‐pot synthesis of trifluoromethylated amines at room temperature using the bench‐stable (Me4N)SCF3 reagent and AgF. The method is rapid, operationally simple and highly selective. It proceeds via a formal umpolung reaction of the SCF3 with the amine, giving quantitative formation of thiocarbamoyl fluoride intermediates within minutes that can readily be transformed to N‐CF3
A compound of formula (I), or a pharmaceutically acceptable salt or ester thereof, wherein R1 is selected from: aryl; heteroaryl; -NHR3; fused aryl-C4-7-heterocycloalkyI; -CONR4R5; -NHCOR6; -C3-7-cycloalkyl; -O-C3-7-cycloalkyl; -NR3R6; and optionally substituted -C1-6 alkyl; wherein said aryl, heteroaryl, fused aryl-C4-7-heterocycloalkyl and C4-7-heterocycloalkyl are each optionally substituted; R2 is selected from hydrogen, aryl, C1-6-alkyl, C2-6-alkenyl, C3-7-cycloalkyl, heteroaryl, C4-7 heterocycloalkyl and halogen, wherein said C1-6-alkyl, C2-6-alkenyl, aryl, heteroaryl and C4-7-heterocycloalkyl are each optionally substituted. Further aspects relate to pharmaceutical compositions, therapeutic uses and process for preparing compounds of formula (I).
Efficient and Versatile Catalytic Systems for the N-Methylation of Primary Amines with Methanol Catalyzed by N-Heterocyclic Carbene Complexes of Iridium
作者:Ken-ichi Fujita、Genki Toyooka、Akiko Tuji
DOI:10.1055/s-0037-1610252
日期:2018.12
an appropriate catalyst). These findings can be used to develop methods for synthesizing useful amine compounds having N-methyl or N,N-dimethyl moieties. Efficient and versatile catalytic systems were developed for the N-methylation of both aliphatic and aromatic primary amines using methanol as the methylating agent. Iridium complexes bearing an N-heterocyclic carbene (NHC) ligand exhibited high catalytic
fragmentations via chemical-bond cleavage are involved in this cycloaddition reaction, it would change the assembly sequence and enable more product diversity. Here, we report a chemoselective nitrosylation of anilines and alkynes through fragmentary or complete NO radical incorporation. The formation of multiple C–N bonds, an unexpected C–N bond, and N=O bond cleavage make this fragmentary cycloaddition
环加成反应已被广泛研究,并为合成环状化合物提供了有效的策略。传统上,反应伙伴被广泛地掺入环状产物中而不会断裂。从不同的角度来看,如果在这种环加成反应中涉及通过化学键裂解的某些片段化,它将改变组装顺序并实现更多的产物多样性。在这里,我们报告通过部分或完全的NO自由基结合苯胺和炔烃的化学选择性亚硝基化。多个C–N键,意外的C–N键和N = O键断裂的形成使该片段性环加成反应成为2,5,2-二氢恶唑,1 H -1,2,3-三唑2-氧化物的有效方法或喹喔啉N-氧化物。在露天,无金属和温和条件下的简便操作使该协议特别实用且有吸引力。还进行了一系列的机理研究和密度泛函理论计算,这有助于解释零碎或完整的NO掺入过程,拓宽了新反应发现的领域。