A PhI(OAc)2-promoted dioxygenation of allyl oximes, including one alkoxylation, has been developed. This reaction can give isoxazoline products bearing two contiguous tetrasubstituted carbons. Various oximes substrates bearing different aryl groups and tetrasubstituted-olefin moieties were compatible with the mild reaction conditions. A two-electron oxidation pathway was proposed based on results of
A highlyefficient cyanosilylation protocol mediated by the easily available n-BuLi with a wide range of aldehydes and ketones was developed. This protocol features excellent yields with very low n-BuLi loadings (0.01–0.05 mol%) at room temperature, solvent-free process, good chemo-/regio-selectivity and functional group tolerance and scalability. A possible reaction pathway based upon stoichiometric
Cyanosilylation of carbonyl compounds catalyzed by half-sandwich (η6-p-cymene) Ruthenium(II) complexes bearing heterocyclic hydrazone derivatives
作者:Govindasamy Vinoth、Sekar Indira、Madheswaran Bharathi、Luis G. Alves、Ana M. Martins、Kuppannan Shanmuga Bharathi
DOI:10.1016/j.ica.2020.120006
日期:2021.1
half-sandwich (ƞ6-p-cymene) ruthenium(II) complexes supported by heterocyclic hydrazone derivatives of general formula [Ru(ƞ6-p-cymene)(Cl)(L)] where L represents N’-((1H-pyrrol-2-yl)methylene)furan-2-carbohydrazide (L1), N’-((1H-pyrrol-2-yl)methylene)thiophene-2-carbohydrazide (L2) or N’-((1H-pyrrol-2-yl)methylene)isonicotinohydrazide (L3) were synthesized. Both ligand precursors and complexes were characterized
Dimeric alumatranes as catalysts for trimethylsilylcyanation reaction
作者:Yoseph Kim、Kang Mun Lee、So Han Kim、Jung Hee Moon、Youngjo Kim
DOI:10.1039/c7ra09851k
日期:——
The solid-state structures of dimeric alumatranes with three five-membered rings chelated by [(OCMe2CH2)nN(CH2CH2O)3−n]3− (n = 1, L1; n = 2, L2; n = 3, L3), which vary by the number of CMe2 groups adjacent to the OH functionality [1 (L1H3), 2 (L2H3), and 3 (L3H3)], were determined by single-crystal X-ray diffraction. The X-ray structures revealed that the aluminum geometries were slightly distorted
具有[[OCMe 2 CH 2)n N(CH 2 CH 2 O)3- [ n ]]螯合的三个五元环的二聚体alumatranes的固态结构3-(n = 1,L1 ; n = 2,L2 ; n = 3,L3),其变化取决于与OH官能团[ 1(L1H 3),2(L2H 3)和3(L3H 3)相邻的CMe 2基团的数量)],通过单晶X射线衍射测定。X射线结构表明,铝的几何形状略微扭曲了三角双锥体。所获得的铝配合物是具有三环五元环的第一个结构表征的二聚体金铝酰胺。出乎意料的是,通过密度泛函理论计算确定,带有二甲基取代基的空间庞大的侧臂始终位于桥接位点。通过1 H,13 C和27 Al NMR技术分析了它们的溶液状态结构,并通过质谱确定了它们的气相结构。与Al(OCH 2 CH 2)3 N不同,配合物1-3它们都是固态,固溶相和气相的二聚体。此外,发现它们可以促进芳基,杂芳基和烷基醛与三甲基甲硅烷基