A novel application of DDQ as electrophile in the Nenitzescu reaction
作者:U. Kucklaender、R. Bollig、W. Frank、A. Gratz、J. Jose
DOI:10.1016/j.bmc.2011.03.006
日期:2011.4
Reaction of 2,3-dichloro-5,6-dicyano-benzoquinone (DDQ) with secondary enaminones yields surprisingly 2-aza-spiro[4,5]decatrienes. The reaction occurs via cyclisation of the primary Michael-adduct with the nitrile group. Reaction of DDQ with tertiary and also certain secondary enamines leads to 3-amino-benzo[b]furan derivatives. This is formed not by Michael-addition, but via geminate radical ion pair
2,3-二氯-5,6-二氰基苯并醌(DDQ)与仲烯胺酮的反应令人惊讶地产生了2-氮杂-螺[4,5]癸二烯。该反应通过伯烷基加成基与腈基的环化而发生。DDQ与叔胺以及某些仲烯胺的反应生成3-氨基-苯并[ b ]呋喃衍生物。这不是通过迈克尔加成反应形成的,而是通过形成自由基自由基对并随后生成氧碳键生成苯并呋喃而形成的。对新产品进行了研究,以抑制纯化的人蛋白激酶CK2及其一般的细胞抑制活性。结果表明,活性最高的化合物是3-氨基-5-羟基-苯并呋喃衍生物11s,CK2的IC 50值为0.2μM。
The synthesis of pantherine and related compounds
作者:K. Bowden、G. Crank、W. J. Ross
DOI:10.1039/j39680000172
日期:——
One of the active principles of Amanita muscaria, 5-aminomethyl-3-hydroxyisoxazole (I) has been synthesised from 3-bromo-5-methylisoxazole by way of 3-methoxyisoxazole-5-acetic acid (XIII), and from 3-methoxyisoxazole-5-carboxylic acid (XXa) by reduction of its amide with diborane. Analogues of (I) with methyl and ethyl substituents in the 4-position have been prepared similarly from 3-hydroxy-4,5-dimethylisoxazole
Darstellung, eigenschaften und umsetzungen von (β-alkoxycarbonyl-alkyliden)-ammoniumsalzen
作者:H. Böhme、J.Grätzel Von Grätz
DOI:10.1016/0040-4020(77)80031-8
日期:1977.1
Iminium salts 3 and 5 are accessible by alkylation or protonation of β-alkoxycarbonyl-enamines. They have been isolated and characterized by 1H NMR spectra. Their reaction products formed with nucleophiles such as organomagnesium or CH-acidic compounds (dimedone, acetophenone), are also investigated and shown partly to undergo secondary reactions under amine elimination.
亚胺盐3和5可通过β-烷氧基羰基-烯胺的烷基化或质子化而获得。它们已被分离并通过1 H NMR光谱进行了表征。还研究了它们与亲核试剂如有机镁或CH酸性化合物(二甲酮,苯乙酮)形成的反应产物,并部分显示在胺消除下会发生二级反应。
Visible‐Light‐Induced Domino Cyclization to Access Pyrido[2,3‐d]pyrimidine‐2,4‐diones via a Radical‐Polar Crossover Reaction
作者:Wanqing Zuo、Yu Cheng、Zhizhen Zhu、Lingling Zuo、Xiao Geng、Zhifang Li、Lei Wang
DOI:10.1002/cjoc.202400315
日期:2024.10
and green strategies for the synthesis of privileged scaffolds are synthetically appealing. We now report a radical-polarcrossover (RPC)-enabled three-component cyclization of bromodifluoroalkyls with enaminones and 6-aminouraciles via a visible-light-induced domino cyclization. The reaction exhibited a broad substrate scope (> 40 examples) including complex molecules, which highlighted the utility