非血红素铁基卤化酶通过铁 ( IV )-氧代卤化物活性物质促进 sp 3 -C–H 键的选择性卤化。在卤化过程中,酶系统中可以完全防止竞争性羟基化。然而,合成铁( IV )-氧代-卤化物中间体通常会产生卤化和羟基化产物的混合物。在本报告中,我们开发了一种新的合成策略,采用非血红素铁基配合物通过超越羟基化进行选择性 sp 3 -C–H 卤化。室温稳定的铁( IV )-氧配合物 [Fe(2PyN2Q)(O)] 2+用于从脂肪族底物和铁( II )-卤化物 [Fe II (2PyN2Q) 中夺取氢原子 (HAA) (X)] + (X,卤素) 结合使用将卤素原子传递给随后的碳中心基团。尽管铁( IV )-氧代是脂肪族底物羟基化的有效促进剂,但本研究中HAA和卤素原子转移的完美相互作用导致通过改变羟基化途径选择性地产生卤化产物。实验研究概述了铁( IV )-氧介导的卤化反应的机制细节。PhCH 3和
A copper(II)-catalyzed borylation of alkyl halides with bis(pinacolato)diboron (B2pin2) has been developed, which can be carried out in air, providing a wide range of primary, secondary, and some tertiary alkylboronates in high yields. A variety of functional groups are tolerated and the protocol is also applicable to unactivated alkyl chlorides (including 1,1- and 1,2-dichlorides). Preliminary mechanistic
Iron-Based Catalyst for Borylation of Unactivated Alkyl Halides without Using Highly Basic Organometallic Reagents
作者:Sheema Siddiqui、Ramesh Bhawar、K. Geetharani
DOI:10.1021/acs.joc.0c02364
日期:2021.1.15
alkyl bromides and chlorides with bis(neopentylglycolato)diborane (B2neop2) mediated by iron-bis amide is described. The reaction proceeds with a broad substrate scope and good functional group compatibility. Moreover, sufficient catalytic activity was obtained for primary and secondary alkyl halides. Mechanistic studies indicate that the reaction proceeds through a radical pathway.
Oxidative Addition to Palladium(0) Made Easy through Photoexcited-State Metal Catalysis: Experiment and Computation
作者:Rajesh Kancherla、Krishnamoorthy Muralirajan、Bholanath Maity、Chen Zhu、Patricia E. Krach、Luigi Cavallo、Magnus Rueping
DOI:10.1002/anie.201811439
日期:2019.3.11
conditions. Mechanistic investigations and density functional theory (DFT) studies suggest that a photoinduced inner‐sphere mechanism is operative in which a barrierless, single‐electron transfer oxidativeaddition of the alkyl halide to Pd0 is key for the efficient transformation.
[EN] IRON BISPHENOLATE COMPLEXES AND METHODS OF USE AND SYNTHESIS THEREOF<br/>[FR] COMPLEXES BISPHÉNOLATES DE FER ET LEURS PROCÉDÉS D'UTILISATION ET DE SYNTHÈSE
申请人:UNIV PRINCE EDWARD ISLAND
公开号:WO2013053046A1
公开(公告)日:2013-04-18
The present application, relates to iron bisphenolate complexes and methods of use and synthesis thereof. The iron complexes are prepared from tridentate or tetradentate ligands of Formula I: wherein R1 and R2 are as defined herein. Also provided are methods and processes of using the iron bisphenolate complexes as catalysts in cross-coupling reactions and in controlled radical polymerizations.
iron(III) acetoacetate (Fe(acac)3) and tetramethylethylenediamine (TMEDA) enables the direct cross-coupling of alkyl halides with bis(pinacolato)diboron. This approach allows for the borylation of activated or unactivated primary, secondary, and tertiary bromides. Moreover, even the borylation of benzylic or allylic chlorides, tosylates, and mesylates are possible. The reactions proceed under mild conditions