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.
intramolecular CHamination and aziridination reactions were developed. Sulfamate esters were converted to oxathiazinanes by using CoPd(OAc)4 as catalyst and PhI(OAc)2 as oxidant. The mutual presence of both Co and Pd is crucial for the catalytic activity. This combination of twometals with simple acetate ligands provides an economical alternative to the Rh‐catalyzed insertion of nitrenoids into CH bonds
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