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。
Synthesis of Aldehydes from Carboxylic Acids via 2-Imidazolines
作者:Zhen Shi、Huan Gu
DOI:10.1080/00397919708004139
日期:1997.8
2-substituted-2-imidazolines as precursors to 2-hydroxy aldehyde, unsaturated aldehyde and a variety of functionalized aldehydes is reported. It provides a novel method for the preparation of aldehydes from carboxylic acids via 2-substituted-2-imidazolines.
A novel ternary GO@SiO
<sub>2</sub>
‐HPW nanocomposite as an efficient heterogeneous catalyst for the synthesis of benzazoles in aqueous media
作者:Setareh Habibzadeh、Ghasem Firouzzadeh Pasha、Mahmood Tajbakhsh、Nasim Amiri Andi、Ehsan Alaee
DOI:10.1002/jccs.201800323
日期:2019.8
electron microscopy (SEM), and powder X‐ray diffraction (XRD). The prepared nanocomposite could be dispersed homogeneously in water and further used as a heterogeneous, reusable, and efficient catalyst for the synthesis of benzimidazoles and benzothiazoles by the reaction of 1,2‐phenelynediamine or 2‐aminothiophenol with different aldehydes.
heterocyclic-imidazoline compounds have been prepared and evaluated in vitro as imidazoline sites (I1 and I2) and alpha-adrenergic (alpha1 and alpha2) receptor ligands. Their pKi values indicate that linkage of the imidazoline moiety at the 2-position with an aromatic substituent dramatically decreases alpha-adrenergic affinity. I1 sites are more accessible by phenyl imidazolines substituted by a methyl or a methoxy
tetrazoles, triazoles, and imidazolines. The magnetic silica sphere grafted sulfonic acid (MSS-SO3H) is suitable for the synthesis of 1,2,3-triazole via the cycloaddition of nitroalkene with NaN3, whereas the zinc-modified silica sphere catalyst (MSS-SO3Zn) is more suitable for the synthesis of tetrazoles. The MSS-SO3Zn catalyst also works well for the synthesis of 2-substituted imidazoline via the condensation