申请人:The Board of Trustees of the University of Illinois
公开号:US20190106448A1
公开(公告)日:2019-04-11
Reactions that directly install nitrogen into C—H bonds of complex molecules are significant because of their potential to change the chemical and biological properties of a given compound. Selective intramolecular C—H amination reactions that achieve high levels of reactivity, while maintaining excellent site-selectivity and functional-group tolerance is a challenging problem. Herein is reported a manganese perchlorophthalocyanine catalyst [Mn
III
(ClPc)] for intermolecular benzylic C—H amination of bioactive molecules and natural products that proceeds with unprecedented levels of reactivity and site-selectivity. In the presence of Brønsted or Lewis acid, the [Mn
III
(ClPc)]-catalyzed C—H amination demonstrates unique tolerance for tertiary amine, pyridine and benzimidazole functionalities. Mechanistic studies indicate that C—H amination proceeds through an electrophilic metallonitrene intermediate via a stepwise pathway where C—H cleavage is the rate-determining step of the reaction. Collectively these mechanistic features contrast previous base-metal catalyzed C—H aminations.
Rhodium-catalyzed intermolecular C(sp<sup>3</sup>)–H amination in a purely aqueous system
作者:Xunbo Lu、Yufeng Shi、Fangrui Zhong
DOI:10.1039/c7gc03149a
日期:——
An efficient Rh-catalyzed intermolecularC(sp3)–Hamination in a purely aqueous system is developed for the first time. This methodology features environmental benignity, broad substrate scope and versatility in late-stage functionalization of several biologically important molecules. Such an oxidation protocol provides easy access to various aliphatic amine derivatives in an efficient and sustainable
申请人:The Board of Trustees of the University of Illinois
公开号:US10611786B2
公开(公告)日:2020-04-07
Reactions that directly install nitrogen into C—H bonds of complex molecules are significant because of their potential to change the chemical and biological properties of a given compound. Selective intramolecular C—H amination reactions that achieve high levels of reactivity, while maintaining excellent site-selectivity and functional-group tolerance is a challenging problem. Herein is reported a manganese perchlorophthalocyanine catalyst [MnIII(ClPc)] for intermolecular benzylic C—H amination of bioactive molecules and natural products that proceeds with unprecedented levels of reactivity and site-selectivity. In the presence of Brønsted or Lewis acid, the [MnIII(ClPc)]-catalyzed C—H amination demonstrates unique tolerance for tertiary amine, pyridine and benzimidazole functionalities. Mechanistic studies indicate that C—H amination proceeds through an electrophilic metallonitrene intermediate via a stepwise pathway where C—H cleavage is the rate-determining step of the reaction. Collectively these mechanistic features contrast previous base-metal catalyzed C—H aminations. The catalyst can be a compound of Formula I:
Catalytic Intermolecular Amination of C−H Bonds: Method Development and Mechanistic Insights
作者:Kristin Williams Fiori、J. Du Bois
DOI:10.1021/ja0650450
日期:2007.1.1
y Reaction methodology for intermolecular C-H amination of benzylic and 3 degrees C-H bonds is described. This process uses the starting alkane as the limiting reagent, gives optically pure tetrasubstituted amines through stereospecific insertion into enantiomeric 3 degrees centers, displays high chemoselectivity for benzylic oxidation, and enables the facile preparation of isotopically enriched N-15-labeled compounds. Access to substituted amines, amino alcohols, and diamines is thereby made possible in a single transformation. Important information relevant to understanding the initial steps in the catalytic cycle, reaction chemoselectivity, the nature of the active oxidant, and pathways for catalyst inactivation has been gained through mechanistic analysis; these studies are also presented.
Manganese-catalysed benzylic C(sp3)–H amination for late-stage functionalization
作者:Joseph R. Clark、Kaibo Feng、Anasheh Sookezian、M. Christina White
DOI:10.1038/s41557-018-0020-0
日期:2018.6
intermolecular benzylic C–H amination of bioactive molecules and natural products that proceeds with unprecedented levels of reactivity and site selectivity. In the presence of a Brønsted or Lewis acid, the [MnIII(ClPc)]-catalysed C–H amination demonstrates unique tolerance for tertiary amine, pyridine and benzimidazole functionalities. Mechanistic studies suggest that C–H amination likely proceeds