Superbase-promoted selective carbon–carbon bond cleavage driven by aromatization
作者:Can Liu、Xianjin Zhu、Yongzhen Han、Haijun Yang、Changjin Zhu、Hua Fu
DOI:10.1039/c9ob00606k
日期:——
bond cleavage has been disclosed through the copper-catalyzed reaction of 1-alkyl-3-alkylindolin-2-imine hydrochlorides with substituted 1-(bromomethyl)-2-iodobenzenes leading to fused N-heterocycles. Mechanistic studies showed that the intrinsic drive of aromatization and the action of the superbase derived from sodium tert-butoxide and dimethylsulfoxide were the key factors leading to the carbon–carbon
A PIDA mediatedintramolecularoxidative C–N coupling and subsequent detosylative aromatization to afford indolo[2,3-b]quinoline derivatives has been developed. This tandem reaction provided an efficient method for the synthesis of valuable indolo[2,3-b]quinoline derivatives.
已经开发了一种 PIDA 介导的分子内氧化 C-N 偶联和随后的去甲苯基芳构化以提供吲哚 [2,3- b ] 喹啉衍生物。这种串联反应为合成有价值的吲哚[2,3- b ]喹啉衍生物提供了一种有效的方法。
Sequence-Specific Dual DNA Binding Modes and Cytotoxicities of N-6-Functionalized Norcryptotackieine Alkaloids
from interactions with DNA. Here, we examined the effect of substitutions at the N-6 position of norcryptotackieine on the cytotoxicity, as well as structure–activity relationship studies pertaining to sequence specific DNA-binding affinities. The representative compound 6d binds DNA in a nonintercalative/pseudointercalative fashion, in addition to nonspecific stacking on DNA, in a sequence selective
Norcryptotackieine ( 1a ) 属于吲哚喹啉类生物碱,从Cryptolepis sanguinolenta中分离出来,Cryptolepis sanguinolenta 是一种传统上用作抗疟剂的植物。 1a的额外结构修饰可能会增强其治疗效力。吲哚喹啉类化合物,如隐花碱、新隐花碱、异隐花碱和新异异隐花碱,由于其与 DNA 相互作用产生的细胞毒性,其临床应用受到限制。在这里,我们检查了去甲隐他基因 N-6 位点的取代对细胞毒性的影响,以及与序列特异性 DNA 结合亲和力相关的构效关系研究。代表性化合物6d除了以序列选择性方式非特异性堆积在 DNA 上之外,还以非嵌入/假嵌入方式结合 DNA。 DNA 结合研究清楚地确立了 N-6 取代的去甲隐他基因和新隐烯平的 DNA 结合机制。在不同细胞系(HEK293、OVCAR3、SKOV3、B16F10 和 HeLa)上筛选合成的去甲隐他烯6c
Copper-catalyzed C(sp)–H aryl amination enables modular synthesis of quinolines and 2-quinolinones
作者:Yang Gao、Haixia Li、Simin Yang、Yanping Huo、Qian Chen、Xianwei Li、Zhe Wang、Xiao-Qiang Hu
DOI:10.1007/s11426-023-1739-y
日期:2024.2
Herein, we disclose a novel copper-catalyzed C(sp)–H aryl amination of terminal alkynes with anthranils, enabling the rapid generation of highly reactive secondary N-aryl ynamines for the modular synthesis of structurally diverse C2-substituted quinolines and 2-quinolinones. The in-situ formed carbonyl-ynamines are prone to tautomerize to carbonyl-ketenimines, which can efficiently react with a series
在此,我们公开了一种新型的铜催化末端炔烃与邻氨基苯酚的C(sp)-H芳基胺化反应,能够快速生成高反应性仲N-芳基炔胺,用于结构多样的C2取代喹啉和2-喹啉酮的模块化合成。原位形成的羰基烯胺易于互变异构为羰基烯酮亚胺,可与一系列亲核试剂,包括胺、醇、酚、硫醇、苯硫酚、活性亚甲基化合物,甚至水有效反应,生成各种喹啉衍生物,产生 H 2 O 作为唯一的绿色副产品。该方法还开辟了创建各种喹啉稠合杂环的实用途径,并可成功应用于复杂分子的后期修饰和生物活性靶标的简洁合成。机理研究揭示了使用邻氨基苯甲醚作为新型芳基氮烯前体的铜催化内球氮烯转移过程。
One-Pot Access to Indolo[2,3-<i>b</i>]quinolines by Electrophile-Triggered Cross-Amination/Friedel–Crafts Alkylation of Indoles with 1-(2-Tosylaminophenyl)ketones
Activation of C2 and C3 of indoles by molecular iodine (I-2) and base followed by in situ reaction with 1-(2-tosylaminophenyl)ketones or 2-tosylaminobenzaldehyde can afford highly substituted indolo(2,3-b)quinolines in moderate to excellent yields (up to 99%). The reaction provides a metal-free selective difunctionalization of indoles. The synthetic potential of the protocol has been illustrated by the synthesis. of neocryptolepine and its 11-methyl analogue.