对 Ni 催化的烷基-烷基熊田型交叉偶联反应进行了结构-活性研究。合成了一系列新的镍(II)配合物,包括具有三齿钳状双(氨基)酰胺配体((R)N(2)N)和具有双齿混合氨基-酰胺配体((R)NN)的配合物并对其进行了结构表征. 这些配合物的配位几何形状从方形平面、四面体到方形金字塔形。该配合物已被研究作为未活化的烷基卤化物,特别是仲烷基碘化物与烷基格氏试剂交叉偶联的预催化剂。与先前报道的 Ni 钳形复合物 [((Me)N(2)N)NiCl] 获得的结果进行了比较。预催化剂中的金属转移位点对于催化是必需的。预催化剂的配位几何形状和自旋状态影响很小或没有影响。这项工作导致发现了几种明确定义的 Ni 催化剂,这些催化剂比钳形复合物 [((Me)N(2)N)NiCl] 更活跃、更有效,用于偶联仲烷基卤化物。最好的两种催化剂是 [((H)NN)Ni(PPh(3))Cl] 和 [((H)NN)Ni(2
Direct conversion of alcohols into the corresponding iodides
作者:Reni Joseph、Pradeep S. Pallan、A. Sudalai、T. Ravindranathan
DOI:10.1016/0040-4039(94)02315-3
日期:1995.1
A mild and effective procedure for directly converting secondary, tertiary and benzylic alcohols into the corresponding iodides is described using I2 in refluxing petroleum ether. The reaction proceeds with inversion of configuration.
Compounds of the formula (I) wherein the substituents are as defined in claim 1, useful as a pesticides, and especially fungicides.
式(I)中的化合物,其中取代基如权利要求1中定义的那样,可用作杀虫剂,尤其是杀真菌剂。
Photoinduced Palladium‐Catalyzed Dicarbofunctionalization of Terminal Alkynes
作者:Zhen Yang、Rene M. Koenigs
DOI:10.1002/chem.202005391
日期:2021.2.19
photochemical activation of palladium complexes enabled this strategic dicarbofunctionalization via addition of alkyl radicals from secondary and tertiary alkyl iodides and formation of an intermediate palladium vinyl complex that could undergo subsequent Sonogashira reaction with a second alkyne molecule. This alkylation–alkynylation sequence allowed the one‐step synthesis of 1,3‐enynes including heteroarenes
Metal-free visible-light-initiated direct C3 alkylation of quinoxalin-2(1<i>H</i>)-ones and coumarins with unactivated alkyl iodides
作者:Jun Sun、Hua Yang、Bo Zhang
DOI:10.1039/d1gc03992j
日期:——
visible-light-promoted direct C3 alkylation of quinoxalin-2(1H)-ones and coumarinsusing readily accessible unactivated alkyl iodides as alkylation reagents. By applying this new approach, a broad range of valuable 3-alkylated quinoxalin-2(1H)-ones and coumarins (55 examples) can be facilely obtained at room temperature, thus showing the wide utility of this protocol. Notably, this practical reaction occurs under
我们首次报告了使用容易获得的未活化烷基碘作为烷基化试剂对喹喔啉-2(1 H )-酮和香豆素进行可见光促进的直接 C3 烷基化。通过应用这种新方法,可以在室温下轻松获得各种有价值的 3-烷基化 quinoxalin-2(1 H )-ones 和香豆素 (55 个例子),从而显示了该协议的广泛实用性。值得注意的是,这种实际反应发生在无金属和无外部光催化剂的条件下,表现出广泛的底物范围和高官能团耐受性。
Synthesis of Multisubstituted Allenes via Nickel-Catalyzed Cross-Electrophile Coupling
作者:Youxiang Jin、Hao Wen、Feiyan Yang、Decai Ding、Chuan Wang
DOI:10.1021/acscatal.1c04143
日期:2021.11.5
context, we report the successful application of a cross-electrophile strategy in the synthesis of multisubstituted allenes. Under the catalysis of nickel, reductive cross-couplingbetween propargyl carbonates and organoiodides provides an entry to prepare tri- or tetrasubstituted allenes without employing any pregenerated organometallics. Furthermore, propargyl carbonates also prove to be suitable allenylating