Transition metal-free catalytic reduction of primary amides using an abnormal NHC based potassium complex: integrating nucleophilicity with Lewis acidic activation
作者:Mrinal Bhunia、Sumeet Ranjan Sahoo、Arpan Das、Jasimuddin Ahmed、Sreejyothi P.、Swadhin K. Mandal
DOI:10.1039/c9sc05953a
日期:——
potassium complex was used as a transitionmetal-free catalyst for reduction of primary amides to corresponding primary amines under ambient conditions. Only 2 mol% loading of the catalyst exhibits a broad substrate scope including aromatic, aliphatic and heterocyclic primary amides with excellent functional group tolerance. This method was applicable for reduction of chiral amides and utilized for the synthesis
Primary amides to amines or nitriles: a dual role by a single catalyst
作者:Hari S. Das、Shyamal Das、Kartick Dey、Bhagat Singh、Rahul K. Haridasan、Arpan Das、Jasimuddin Ahmed、Swadhin K. Mandal
DOI:10.1039/c9cc05856g
日期:——
of various primary amides to amines (25 examples). On simple modification of the reaction conditions such as in the presence of a catalytic amount of secondary amide, the same catalyst can transform the primary amides into intermediate nitrile compounds (16 examples) in excellent yields. This is the first example where such a controlled catalytic transformation of primary amides to amines or nitriles
An imidazolin-2-iminato ligand organozinc complex as a catalyst for hydroboration of organic nitriles
作者:Suman Das、Jayeeta Bhattacharjee、Tarun K. Panda
DOI:10.1039/c9nj04076e
日期:——
The reaction of diethylzinc with imidazolin-2-imines (ImRNH, R = Dipp (2,6-diisopropylphenyl)), Mes (2,4,6-trimethylphenyl), and tBu (tert-butyl) afforded the corresponding dimeric zinc(II) imidazolin-2-iminato complexes [(ImRN)Zn(CH2CH3)}2] (R = Dipp, 1a; R = Mes, 1b; R = tBu, 1c). The zinc complexes were characterised using spectroscopic techniques and the molecular structure of complex 1b was established
二乙基锌与咪唑啉-2-亚胺(Im R NH,R = Dipp(2,6-二异丙基苯基)),Mes(2,4,6-三甲基苯基)和t Bu(叔丁基)的反应得到相应的二聚体锌(II)咪唑啉-2-亚氨基配合物[(Im R N)Zn(CH 2 CH 3)} 2 ](R = Dipp,1a ; R = Mes,1b ; R = t Bu,1c)。锌配合物用光谱技术表征,配合物1b的分子结构通过单晶X射线衍射分析确定。复杂1c将其用作在环境温度下与频哪醇硼烷(HBpin)进行有机腈化学选择性加氢硼化的催化剂,以高收率获得具有广泛底物范围的二硼胺。锌配合物1c对催化硼氢化反应具有广泛的底物范围和良好的官能团耐受性。在动力学研究的基础上提出了一个最合理的机制。
TBAF-catalyzed hydrosilylation for the reduction of aromatic nitriles
The selective catalytic hydrosilylation of functional groups is becoming an interesting tool for organic synthesis. In the present study, fluoride-catalyzedhydrosilylations of aromatic nitriles have been examined in detail. Using catalytic amounts of inexpensive tetra-n-butylammonium fluoride (TBAF) various aromatic nitriles are reduced in good yields under mild conditions.
reported and its catalytic activity towards the reduction of ketones and nitriles is studied. On comparing the reactivity of various other Mn(I) complexes supported by benzimidazole ligand, it was observed that the Mn(I) complexes bearing 6-methylpyridine and benzimidazole fragments exhibited the highest catalytic activity towards monohydrosilylation of ketones and dihydrosilylation of nitriles. Using this