The development of readily tunable and regioselective C-H functionalization reactions that operate solely through catalyst control remains a challenge in modern organic synthesis. Herein, we report that simple silver catalysts supported by common nitrogenated ligands can be used to tune a nitrene transfer reaction between two different types of C-H bonds. The results reported herein represent the first example of ligand-controlled and site-selective silver-promoted C-H amination.
Nonheme Iron-Mediated Amination of C(sp<sup>3</sup>)–H Bonds. Quinquepyridine-Supported Iron-Imide/Nitrene Intermediates by Experimental Studies and DFT Calculations
作者:Yungen Liu、Xiangguo Guan、Ella Lai-Ming Wong、Peng Liu、Jie-Sheng Huang、Chi-Ming Che
DOI:10.1021/ja3122526
日期:2013.5.15
(1, qpy = 2,2':6',2″:6″,2''':6''',2''''-quinquepyridine) is a highly active nonheme iron catalyst for intra- and intermolecular amination of C(sp(3))-H bonds. This complex effectively catalyzes the amination of limiting amounts of not only benzylic and allylic C(sp(3))-H bonds of hydrocarbons but also the C(sp(3))-H bonds of cyclic alkanes and cycloalkane/linear alkane moieties in sulfamate esters,
申请人:The Board of Trustees of the University of Illinois
公开号:US20160272662A1
公开(公告)日:2016-09-22
The invention provides novel manganese catalysts such as [Mn(
t
BuPc)], which are general for the amination of all types of C(sp
3
)-H bonds (aliphatic, allylic, propargylic, benzylic, ethereal), including strong 1
o
aliphatic C—H bonds, while achieving excellent chemoselectivity, stereospecificity, and high functional group tolerance. We demonstrate the late-stage diversification of bioactive complex molecules that encompass the range of C(sp
3
)-H bond types, such as selective 1
o
C—H aminations of betulinic acid and pleuromutilin derivatives. The catalysts' unprecedented balance of reactivity and selectivity is in part attributed to its mechanism of C—H amination that lies between stepwise and concerted.
A manganese catalyst for highly reactive yet chemoselective intramolecular C(sp3)–H amination
作者:Shauna M. Paradine、Jennifer R. Griffin、Jinpeng Zhao、Aaron L. Petronico、Shannon M. Miller、M. Christina White
DOI:10.1038/nchem.2366
日期:2015.12
is an outlier to the reactivity–selectivity paradigm. It is unique in its capacity to functionalize all types of C(sp3)–H bond intramolecularly, while displaying excellent chemoselectivity in the presence of π functionality. Mechanistic studies indicate that [Mn(tBuPc)] transfers bound nitrenes to C(sp3)–H bonds via a pathway that lies between concerted C–H insertion, observed with reactive noble metals
作者:Juliet M. Alderson、Alicia M. Phelps、Ryan J. Scamp、Nicholas S. Dolan、Jennifer M. Schomaker
DOI:10.1021/ja5094309
日期:2014.12.3
The development of readily tunable and regioselective C-H functionalization reactions that operate solely through catalyst control remains a challenge in modern organic synthesis. Herein, we report that simple silver catalysts supported by common nitrogenated ligands can be used to tune a nitrene transfer reaction between two different types of C-H bonds. The results reported herein represent the first example of ligand-controlled and site-selective silver-promoted C-H amination.