Syntheses, electrochemistry and molecular modeling of N,N′-dicyanoquinonediimine (DCNQI) derivatives of substituted 1,4-anthracenediones: precursors for organic metals.
摘要:
The title compounds (10) have been obtained from the corresponding 1,4-anthracenedione derivatives (3), prepared by different synthetic routes, by reaction with bis(trimethylsilyl)carbodiimide (BTC). The cyclic voltammetry of these compounds (3 and 10) reveals the presence of two reduction waves to the corresponding anion-radical and dianion. The acceptor ability of compounds 10 can be modulated by the presence of substituents on the DCNQI ring. The syn/anti isomers have been studied by molecular mechanics and the results are in good agreement with the H-1-NMR high resolution spectral data.
Laticyclic Conjugated Polyenes. Study on Diels−Alder Cycloadditions of a Facially Dissymmetric Maleic Anhydride
作者:Teh-Chang Chou、Tzong-Shing Jiang、Jenn-Tsang Hwang、Kuan-Jiuh Lin、Cheng-Tung Lin
DOI:10.1021/jo990256r
日期:1999.6.1
obtained from the Diels-Alder cycloaddition of the bicyclic ring-fused cyclohexadiene 1 and acetylenedicarboxylate. Maleic anhydride 2 readily underwent the Diels-Alder cycloadditions with anthracene, 1,3-diphenylisobenzofuran, cyclopentadiene, 1,3-cyclohexadiene, 6,6-dimethylfulvene, and o-quinodimethane. All the cycloadditions occurred exclusively on the pi-face syn to the etheno bridge of 2, thereby
Synthesis and Characterization of a Novel<i>Diels</i>-<i>Alder</i>Adduct of Codeine
作者:Christopher W. Cunningham、Kellie Hom、Chayan Acharya、Angela Wilks、Alexander D. MacKerell、Andrew Coop
DOI:10.1002/hlca.200900234
日期:2010.2
The Diels–Alder reaction was applied to 4,5‐epoxymorphinan opioids to generate a novel aromatic cycloadduct at C(7)C(8): Thermolytic cleavage of sultine 8 produced the reactive diene o‐quinodimethane 7 which condensed favorably with codeine (11), but not with codeinone (9) or 14‐hydroxycodeinone (10), producing the desired tetrahydronaphtho adduct 12 with (7R,8R) geometry (Scheme). The configuration
Benzosulfones as photochemically activated sulfur dioxide (SO<sub>2</sub>) donors
作者:Satish R. Malwal、Harinath Chakrapani
DOI:10.1039/c4ob02466d
日期:——
Sulfurdioxide (SO2) is a gaseous environmental pollutant which is routinely used in industry as a preservative and antimicrobial. Recent data suggests that SO2 may have value as a therapeutic agent. However, due to its gaseous nature, localizing SO2 generation is challenging. Herein, various 1,3-dihydrobenzo[c]thiophene 2,2-dioxides (benzosulfones) were prepared as candidates for photochemically activated
二氧化硫(SO 2)是一种气态环境污染物,在工业上通常用作防腐剂和抗菌剂。最新数据表明,SO 2可能具有治疗作用。然而,由于其气态性质,本地化SO 2的产生是具有挑战性的。在此,制备各种1,3-二氢苯并[ c ]噻吩2,2-二氧化物(苯并砜)作为光化学活化的二氧化硫(SO 2)产生的候选物。发现这些化合物在缓冲液中稳定,但在紫外线照射下会被光解产生SO 2。。我们的数据表明苯砜的光解取决于取代基,并且给电子基团的存在导致SO 2的产率提高。
o-quinodimethanes from 3,6-dihydrobenzo[b]-1,2-oxathiin-2-oxides
作者:James L. Charlton、Tony Durst
DOI:10.1016/s0040-4039(01)81585-9
日期:——
o-tolual-dehyde via the photochemically produced 1-hydroxy-1,3-dihydrobenzo[b]thiophene-2,2-dioxide is described. Analogous syntheses of 3 and 6 substituted derivatives of the benzosultines 5 have also been carried out. The feasibility of using these benzosultines as o-quinodimethane precursors has been tested by thermalizing the phenyl sultine 5c in refluxing cyclohexane in the presence of dimethyl fumarate, dimethyl
Divergent Approach to the Bisanthraquinone Natural Products: Total Synthesis of (<i>S</i>)-Bisoranjidiol and Derivatives from Binaphtho-<i>para</i>-quinones
作者:Erin E. Podlesny、Marisa C. Kozlowski
DOI:10.1021/jo302364h
日期:2013.1.18
development of the first asymmetricsynthesis of a chiral anthraquinone dimer is outlined, resulting in the first totalsynthesis of (S)-bisoranjidiol. Rather than a biomimetic dimerization retrosynthetic disconnection, the anthracenyl ring systems are generated after formation of the axially chiral binaphthalene framework. This synthetic strategy has enabled the synthesis of several analogues. Key
概述了手性蒽醌二聚体的第一次不对称合成的发展,从而导致了 ( S )-双茚二醇的第一次全合成。不是仿生二聚化逆合成断开,而是在形成轴向手性联萘骨架后生成蒽环系统。这种合成策略使几种类似物的合成成为可能。合成的主要功能包括的对映选择性耦合受阻含有替代2-萘酚迫到的C-C键形成的部位,8,8'-羟基化binaphthols到binaphtho-区域选择性氧化段-quinones,和串联区域选择性Diels-Alder/芳构化反应。