initially the fabrication of a single-atom photocatalyst Ni/TiO2 for the visible-light-induced site-selective sulfonation of enamides to give amidosulfones with 36 examples up to 99% yield. The experimental results show that this single-atom photocatalyst Ni/TiO2 can achieve site-selective sulfonation of enamide to construct α-amidosulfones and β-propionamidosulfones under visible light. Importantly, such
单原子光催化作为一种重要的有机转化策略已受到越来越多的关注,其性能很大程度上取决于催化剂的设计。该方案最初涉及制造单原子光催化剂Ni / TiO 2,用于可见光诱导的酰胺的位点选择性磺化,以产生酰胺化砜,其中36个实例的收率高达99%。实验结果表明,该单原子光催化剂Ni / TiO 2可以在可见光下实现酰胺的定点磺化,从而构建α-酰胺基砜和β-丙酰胺基砜。重要的是,这种基于单原子光催化的合成系统显示出良好的可回收性,高周转数(最多18 963),对官能团的优异耐受性,并且可以容易地按比例放大并具有良好的效率。
Visible-light-initiated manganese-catalyzed Giese addition of unactivated alkyl iodides to electron-poor olefins
作者:Jianyang Dong、Xiaochen Wang、Zhen Wang、Hongjian Song、Yuxiu Liu、Qingmin Wang
DOI:10.1039/c9cc06400a
日期:——
Herein, we report a mild protocol for direct visible-light-initiated Giese addition of unactivated alkyl iodides to electron-poor olefins (Michael acceptors) with catalysis by decacarbonyl dimanganese, Mn2(CO)10, an inexpensive earth-abundant-metal catalyst. This protocol is compatible with a wide array of sensitive functional groups and has a broad substrate scope with regard to both the alkyl iodide
Selective Syntheses of Metalated Pyridines from Two Different Unsymmetrical Acetylenes, a Nitrile, and a Titanium(II) Alkoxide
作者:Daisuke Suzuki、Ryoichi Tanaka、Hirokazu Urabe、Fumie Sato
DOI:10.1021/ja017766z
日期:2002.4.1
Cyclotrimerization of two different, unsymmetrical acetylenes and p-toluenesulfonylnitrile with a divalent titanium alkoxide reagent, Ti(O-i-Pr)4/2 i-PrMgCl, yielded single pyridyltitanium compounds in a highly selective manner. These metalated pyridines were confirmed by deuteriolysis to give the corresponding deuterated pyridines and underwent iodinolysis and copper-catalyzed alkylation to demonstrate
两种不同的不对称乙炔和对甲苯磺酰基腈与二价钛醇盐试剂 Ti(Oi-Pr)4/2 i-PrMgCl 的环三聚反应以高度选择性的方式产生单一的吡啶基钛化合物。这些金属化吡啶通过氘分解得到相应的氘化吡啶,并进行碘分解和铜催化烷基化以证明它们的合成效用。或者,由相同的钛 (II) 醇盐介导的炔酰胺、末端乙炔和 α-烷氧基腈的不同类型的环三聚反应再次以高度选择性的方式进行,得到具有钛化侧链的单个吡啶。
Rational design of sulfoxide–phosphine ligands for Pd-catalyzed enantioselective allylic alkylation reactions
A new type of chiral sulfoxide-phosphine ligands have been developed by a rational combination of two privileged scaffolds for Pd-catalyzed asymmetric allylicalkylation reactions. Under optimized conditions, generally high yields (up to 97%) and excellent enantioselectivities (up to >99% ee) were obtained.
Ag(I)/Lewis Acid Cooperatively Promoted Three-Component Coupling for Carbo-Heterofunctionalization of Alkenes
作者:Yigao Tao、Rong Hu、Xiaoming Jie、Weiping Su
DOI:10.1021/acscatal.2c04099
日期:2022.10.21
A silver oxidant/Lewis acid catalyst cooperatively promoted three-component carbo-heterofunctionalization of alkenes is reported. A broad range of nucleophiles, including H2O, alcohols, and anilines, can combine with a variety of 1,3-dicarbonyl compounds or analogues as radical precursors to realize difunctionalization of various styrene derivatives. Interestingly, mechanistic investigations demonstrate