(Arylimido)钒(V) 复合体 V(NAr)(OEt)Cl 2 [氩气= C 6 H 5,对-BrC 6 H 4,对-(MeO)C 6 H 4 ]或V(NAr)Cl 3 [氩气=o -BrC 6 H 4,邻-(MeO)C 6 H 4 ]通过以下反应合成:VO(OEt)Cl 2 或者 VOCl 3分别与相应的芳基异氰酸酯。X射线晶体结构测定V(NAr)(OEt)Cl 2 (氩气= C 6 H 5和p -BrC 6 H 4)阐明了烷氧基桥接的二聚体结构单元[V(NAr)(OEt)Cl 2 ] 2,其中发现苯环上的取代基影响亚氨基氮的特性。的51个V NMR光谱测量表明,钒金属中心的电子状态取决于连接到所述的配位体钒和苯环上的取代基。使用V(N p -BrC 6 H 4)Cl 3或V(N o- BrC 6 H 4)Cl 3进行甲硅烷基乙烯酮缩醛与甲硅烷基烯醇醚的选择性氧化交叉偶联反应。
The iodine‐catalyzed decarboxylative amidation of β,γ‐unsaturated carboxylic acids with chloramine salts is described. This method enables the regioselective synthesis of allylic amides from various types of β,γ‐unsaturated carboxylic acids containing substituents at the α‐ and β‐positions. In the reaction, N‐iodo‐N‐chloroamides, generated by the reaction of a chloramine salt with I2, function as a
Addition of Silyl Ketene Acetals to Nitrones Catalyzed by Lanthanide Triflates
作者:Changtao Qian、Longcheng Wang
DOI:10.1016/s0040-4020(00)00636-0
日期:2000.9
α-Aryl-N-phenyl nitrones reacted with silyl ketene acetals mediated by lanthanum trifloromethanesulfonate (triflate) to afford the addition product in excellent yield under mild conditions. α-Aryl-N-tert-butyl nitrone reacted with ethyl trimethylsilylacetate to yield the unexpected α,β-unsaturated ester in a 100% E-form. A possible mechanism for the process is discussed.
Versatile desilylative cross-coupling of silyl enol ethers and allylic silanes via oxovanadium-induced chemoselective one-electron oxidation
作者:Toshikazu Hirao、Takashi Fujii、Yoshiki Ohshiro
DOI:10.1016/s0040-4020(01)81753-1
日期:1994.8
The chemoselective cross-coupling of silylenolethers and allylic silanes to γ,δ-unsaturated ketones is achieved by the oxovanadium (V)-induced oxidative desilylation of the more readily oxidizable organosilicon compounds.