Full Cleavage of C≡C Bond in Electron-Deficient Alkynes via Reaction with Ethylenediamine
作者:Sergei F. Vasilevsky、Maria P. Davydova、Victor I. Mamatyuk、Nikolay Tsvetkov、Audrey Hughes、Denis S. Baranov、Igor V. Alabugin
DOI:10.1071/ch17026
日期:——
Reaction of 1,2-diaminioethane (ethylenediamine) with electron-deficient alkynes leads to full scission of the C≡Cbond even in the absence of a keto group directly attached to the alkyne. This process involves oxidation of one of the alkyne carbons into C2 of a 2-R-4,5-dihydroimidazole with the concomitant reduction of the other carbon to a methyl group. The sequence of Sonogashira coupling with the
1,2-二氨基乙烷(乙二胺)与缺电子的炔烃反应会导致C≡C键完全断裂,即使没有直接连接到炔烃上的酮基也是如此。该方法涉及将炔烃碳之一氧化成2 - R -4,5-二氢咪唑的C2,同时将另一个碳还原成甲基。这项工作中所述的Sonogashira与乙二胺介导的片段化偶联的序列可用于甲基或4,5-二氢咪唑-2-基部分选择性取代芳基卤化物中的卤素。
Mechanism of С-Н cyclization of alkynylanthraquinones into thienoanthraquinones with the participation of sodium sulfide
anthrahydroquinone, which is inactive in the main reaction. We present a new cyclization mechanism with the key stage involving the electrophilic displacement of H, which results in the formation of the reaction product 2 and elimination of S. In the reaction medium atomic sulfur is transformed into S2, which initiates the next cyclization act. This determines the chain nature of cyclization with the participation
炔基-9,10-蒽醌的CH-环化1到thienoanthraquinones 2被示出为通过中性S为发起2分子,不是如假定在CH-环化的现有模型的nucleophiolic取代的硫化物阴离子H. S 2的形成在反应介质中发生,这是因为底物1被Na 2 S部分还原成相应的蒽氢醌,而后者在主反应中没有活性。我们提出了一种新的环化机理,其关键阶段涉及H的亲电置换,这导致了反应产物2的形成。在反应介质中,原子硫被转化为S 2,从而引发下一个环化作用。这决定了在S 2的参与下环化的链性质。在该模型中,通过引入能够通过简单还原生成S 2的中性醌,提出了提高目标硫代蒽蒽醌产率的途径。
Moroz, A. A.; Budzinskaya, I. A.; Mamedov, T. Z., Journal of Organic Chemistry USSR (English Translation), 1982, vol. 18, p. 1283 - 1286
作者:Moroz, A. A.、Budzinskaya, I. A.、Mamedov, T. Z.、Galevskaya, T. P.
DOI:——
日期:——
Nucleophilic addition of secondary mines to acetylenylakthraquinones
作者:A. V. Piskunov、A. A. Moroz、M. S. Shvartsberg
DOI:10.1007/bf00954230
日期:1986.4
LISTVAN, V. N.;STASYUK, A. P.;KORNILOV, M. YU.;KOMAROV, I. V., ZH. OBSHCH. XIMII, 60,(1990) N, S. 804-807
作者:LISTVAN, V. N.、STASYUK, A. P.、KORNILOV, M. YU.、KOMAROV, I. V.