Copper(II)-mediated intermolecular amination of inert C(sp3)H bonds with simple alkylamines to construct α,α-disubstituted β-amino acid derivatives
作者:Chunxia Wang、Yudong Yang
DOI:10.1016/j.tetlet.2017.01.079
日期:2017.3
Disclosed herein is a copper(II)-mediated chelation-assisted intermolecular amination of inert C(sp3)H bonds using simple alkylamines as the amino source. A straightforward and step-economic alternative to α,α-disubstituted β-amino acid derivatives is provided consequently. This reaction features good functional group tolerance and relatively broad substrate scope. Furthermore, a coupling product between
Nickel-Catalyzed Aminoxylation of Inert Aliphatic C(sp<sup>3</sup>)–H Bonds with Stable Nitroxyl Radicals under Air: One-Pot Route to α-Formyl Acid Derivatives
作者:Chunxia Wang、Luoqiang Zhang、Jingsong You
DOI:10.1021/acs.orglett.7b00479
日期:2017.4.7
Nickel-catalyzed aminoxylation of an unactivated C(sp3)–H bond with a stable nitroxyl radical has been accomplished for the first time to offer various N-alkoxyamine derivatives, which further enables a one-pot approach to α-formyl acid derivatives. The aminoxylation process reported also provides direct evidence for the oxidative addition of a cyclometallic intermediate with a free radical, which
Insertion of unsaturated systems such as alkynes and olefins into unactivated sp3 CH bonds remains an unexplored problem. We herein address this issue by successfully incorporating a wide variety of functionalized alkynes and electron‐deficient olefins into the unactivated sp3 CH bond of pivalic acid derivatives with excellent syn‐ and linear‐ selectivity. A strongly chelating 8‐aminoquinoline directing
Nickel-Catalyzed Site-Selective Alkylation of Unactivated C(sp<sup>3</sup>)–H Bonds
作者:Xuesong Wu、Yan Zhao、Haibo Ge
DOI:10.1021/ja413131m
日期:2014.2.5
The direct alkylation of unactivated sp(3) C-H bonds of aliphatic amides was achieved via nickel catalysis with the assist of a bidentate directing group. The reaction favors the C-H bonds of methyl groups over the methylene C-H bonds and tolerates various functional groups. Moreover, this reaction shows a predominant preference for sp(3) C-H bonds of methyl groups via a five-membered ring intermediate
Copper-Catalyzed Intramolecular Dehydrogenative Amidation of Unactivated C(sp<sup>3</sup>)–H Bonds Using O<sub>2</sub> as the Sole Oxidant
作者:Chunxia Wang、Yudong Yang、Dekun Qin、Zhen He、Jingsong You
DOI:10.1021/acs.joc.5b01302
日期:2015.8.21
In this work, an aerobic copper-catalyzedintramolecularC(sp3)–H amidation has been disclosed, which presents a rare example of copper-catalyzed functionalization of an unactivatedC(sp3)–H bond with O2 as the sole oxidant. In addition, a new protocol for the preparation of a removable 5-methoxyquinolyl moiety has been documented.