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Reactions of 3-arylpropenenitriles with arenes under superelectrophilic activation conditions: Hydroarylation of the carbon-carbon double bond followed by cyclization into 3-arylindanones
Tetrahedron ( IF 2.1 ) Pub Date : 2020-05-18 , DOI: 10.1016/j.tet.2020.131264
Yelizaveta Gorbunova , Dmitriy N. Zakusilo , Irina A. Boyarskaya , Aleksander V. Vasilyev

Reactions of 3-arylpropenenitriles [ArCHCHCN] with arenes [Ar’H] under the superelectrophilic activation conditions with Brønsted superacid TfOH (CF3SO3H) or strong Lewis acid AlBr3 result, first, in the formation of products of hydroarylation of the carbon-carbon double bond, 3,3-diarylpropanenitriles [Ar(Ar’)CHCH2CN]. Reactions may go further in TfOH leading to 3-arylindanones, as products of intramolecular aromatic acylation by the electrophilically activated nitrile group. Intermediate cationic species, derived at the protonation of the starting 3-arylpropenenitriles onto the carbon of CC bond and the nitrile nitrogen, have been studied by DFT calculation. A plausible reaction mechanism including the formation of highly reactive dications [(Ar)HC+–CH2C+ = NH] has been proposed. The obtained 3,3-diarylpropanenitriles have been transformed into pharmaceutically valuable 5-(2,2-diarylethyl)-1H-tetrazoles [Ar(Ar’)CHCH2Tetr] and 3-diarylpropylamines [Ar(Ar’)CH(CH2)2NH2] by the reactions with NaN3 and LiAlH4 correspondingly.



中文翻译:

3-芳基丙烯腈与芳烃在超亲电活化条件下的反应:碳-碳双键加氢芳基化,然后环化成3-芳基茚满酮

3-芳基丙烯腈[ArCH CHCN]与芳烃[Ar'H]在超亲电活化条件下与Brønsted超强酸TfOH(CF 3 SO 3 H)或强路易斯酸AlBr 3的反应首先导致形成碳-碳双键3,3-二芳基丙腈[Ar(Ar')CHCH 2 CN]。反应可能在TfOH中进一步进行,导致3-芳基茚满酮,这是通过亲电子活化的腈基进行分子内芳族酰化的产物。在起始3-芳基丙烯腈质子化到C的碳上衍生的中间阳离子物种通过DFT计算已经研究了C键和腈氮。提出了一种可能的反应机理,包括形成高反应性的指征[(Ar)HC + -CH 2 C +  = NH]。获得的3,3-二芳基丙腈已转化为可药用的5-(2,2-二芳基乙基)-1 H-四唑[Ar(Ar')CHCH 2 Tetr]和3-二芳基丙胺[Ar(Ar')CH(CH 22 NH 2 ]分别与NaN 3和LiAlH 4反应。

更新日期:2020-05-18
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