Intermolecular Markovnikov-Selective Hydroacylation of Olefins Catalyzed by a Cationic Ruthenium–Hydride Complex
作者:Junghwa Kim、Chae S. Yi
DOI:10.1021/acscatal.6b00856
日期:2016.5.6
The cationic Ru–H complex was found to be an effective catalyst for the intermolecularhydroacylation of aryl-substituted olefins with aldehydes to form branched ketone products. The preliminary kinetic and spectroscopic studies elucidated a ruthenium-acyl complex as the key intermediate species. The catalytic method directly afforded branched ketone products in a highly regioselective manner while
with primary and secondary allylic alcohols. The reactions, carried out in aqueous ethanol in the presence of palladium(II) acetate as precatalyst and sodium hydrogen carbonate as base, gave the arylation products with good overall conversion. In all cases, the major products were the β-arylated carbonyl derivatives. The o-benzene-disulfonimide was recovered in high yield from all the reactions, and it
芳烃重氮邻苯二磺酰亚胺与伯和仲烯丙醇反应。在醋酸钯 (II) 作为预催化剂和碳酸氢钠作为碱的存在下,在含水乙醇中进行的反应得到了具有良好总转化率的芳基化产物。在所有情况下,主要产物都是 β-芳基化羰基衍生物。从所有反应中以高收率回收邻苯二磺酰亚胺,并将其循环用于制备其他盐。
Stoichiometric Reactions of Acylnickel(II) Complexes with Electrophiles and the Catalytic Synthesis of Ketones
作者:Alexander C. Wotal、Ryan D. Ribson、Daniel J. Weix
DOI:10.1021/om5004682
日期:2014.10.27
While reactions with bromobenzene formed complex mixtures of ketones, reactions with α-chloroethylbenzene were highly selective for the cross-ketone product. Reactions with iodooctane and bromooctane also produced the cross-ketone product, but in intermediate yield and selectivity. In most cases the presence or absence of a chemical reductant (zinc) had only a small effect on the selectivity of the
酰基镍 (II) 配合物在形成酮的交叉亲电偶联 (XEC) 反应中具有突出的特征,但尚未系统地研究它们的反应性。我们在这里展示了我们对酰基镍 (II) 配合物与一系列碳亲电子试剂的反应性的研究。溴苯、α-氯乙苯、溴辛烷和碘辛烷与 (dtbbpy)Ni II (C(O)C 5 H 11 )(Br) ( 1b ) 和 (dtbbpy)Ni II (C(O)tolyl)(Br) 反应( 1c)形成多种有机产品。虽然与溴苯的反应形成复杂的酮混合物,但与 α-氯乙苯的反应对交叉酮产物具有高度选择性。与碘辛烷和溴辛烷的反应也产生交叉酮产物,但产率和选择性中等。在大多数情况下,化学还原剂(锌)的存在与否对反应的选择性只有很小的影响。1c与碘辛烷的偶联(产率 60%)转化为催化反应,即溴芳烃与伯溴烷烃的羰基化偶联(六个实施例,平均产率 60%)。
Two efficient pathways for the synthesis of aryl ketones catalyzed by phosphorus-free palladium catalysts
作者:A. Wirwis、J. Feder-Kubis、A.M. Trzeciak
DOI:10.1016/j.mcat.2017.10.021
日期:2018.2
Allylic alcohols, 1-buten-3-ol, 1-penten-3-ol and 1-octen-3-ol, reacted with aryl iodides (iodotoluene, 4-iodotoluene, 4-iodophenol and 4-iodanisole) under Heck reaction conditions to form corresponding saturated aryl ketones in one step. The same products were obtained in a two-step tandem reaction consisted of the Heck coupling of allylic alcohols with aryl iodides, followed by hydrogenation. Reactions