Nickel-catalysed chemoselective C-3 alkylation of indoles with alcohols through a borrowing hydrogen method
作者:Amreen K. Bains、Ayanangshu Biswas、Debashis Adhikari
DOI:10.1039/d0cc07169b
日期:——
A nickel catalysed chemoselective C3-alkylation of indole is reported that follows a borrowing hydrogen method promoted by a radical.
一种镍催化的化学选择性C3-吲哚烷基化反应报道了,该反应遵循了由自由基促进的借氢方法。
Hot water-promoted cyclopropylcarbinyl rearrangement facilitates construction of homoallylic alcohols
作者:Pei-Fang Li、Cheng-Bo Yi、Jin Qu
DOI:10.1039/c5ob00305a
日期:——
H2O–1,4-dioxane and without an additional catalyst, the rearrangements of various types of cyclopropylcarbinols were attempted. It was found that the reactions generally gave homoallylic alcohols in good to very high chemical yields. Rearrangements of bicyclic or tricyclic cyclopropylcarbinols readily gave the desired ring-expanded cyclic homoallylic alcohols which are difficult to synthesize by other
Triazolylidene Iron(II) Piano-Stool Complexes: Synthesis and Catalytic Hydrosilylation of Carbonyl Compounds
作者:Chloe Johnson、Martin Albrecht
DOI:10.1021/acs.organomet.7b00349
日期:2017.8.14
series of iron(II) piano stool complexes was synthesized that contain monodentate triazolylidene ligands with different aryl and alkyl substituents as well as an example of a C,N-chelating pyridine-substituted triazolylidene ironcomplex. The electronic and steric effect of wingtip modification was assessed by electrochemical, infrared spectroscopic, and X-ray diffraction analysis. All complexes were active
合成了一系列新的铁(II)钢琴凳子配合物,其中包含具有不同芳基和烷基取代基的单齿三唑亚基配体,以及一个C,N-螯合吡啶取代的三唑基亚铁配合物的实例。通过电化学,红外光谱和X射线衍射分析评估了翼尖修饰的电子和空间效应。所有配合物在醛和酮的催化氢化硅烷化中均具有活性。单齿体系远远胜过螯合的三唑亚基类似物,在催化剂负载量为0.1 mol%时,周转频率TOF max高达14400 h –1。机理研究表明,催化H-Si键活化的根本机理。
Chemoselective C−H Oxidation of Alcohols to Carbonyl Compounds with Iodosobenzene Catalyzed by (Salen)chromium Complex
作者:Waldemar Adam、Feyissa Gadissa Gelalcha、Chantu R. Saha-Möller、Veit R. Stegmann
DOI:10.1021/jo9913457
日期:2000.4.1
secondary alcohols with benzylically and allylically activated C-H bonds are chemoselectively oxidized to the corresponding carbonylcompounds by the (salen)Cr(III) complex I as the catalyst and iodosobenzene as the oxygen source; the oxidizing species is the Cr(V) oxo complex. Allylicalcohols with fully substituted double bonds give appreciable amounts of epoxides besides the C-H oxidation products
Bioinspired Radical‐Mediated Transition‐Metal‐Free Synthesis of N‐Heterocycles under Visible Light
作者:Amreen K. Bains、Yadav Ankit、Debashis Adhikari
DOI:10.1002/cssc.202002161
日期:2021.1.7
extended to multi‐component, one‐pot coupling for the synthesis of quinoline and pyrimidine. This organocatalytic approach is very mild (70 °C, 8 h) compared to a multitude of transition‐metal catalysts that have been used to prepare these heterocycles. A detailed mechanistic study proves the intermediacy of the iminosemiquinonate‐type radical and a critical hydrogen atom transfer step to be involved