Iron-Catalyzed Oxidative C(3)–H Functionalization of Amines
摘要:
Fe-catalyzed direct dehydrogenative C(3)-functionalization of tertiary arylamines was developed via activation of the sp(3) C(3)-H bond. The reaction is applicable to both cyclic and acyclic amines. The key process is the catalytic desaturative enamine formation from tertiary amines and position-selective C-C bond formation (addition to nitro olefins) at the beta-carbon. Products can be converted to versatile and unique nitrogen-containing molecules.
Synthesis of β-Methylsulfonylated N-Heterocycles from Saturated Cyclic Amines with the Insertion of Sulfur Dioxide
作者:Yan He、Jintao Yang、Qimeng Liu、Xinying Zhang、Xuesen Fan
DOI:10.1021/acs.joc.0c02368
日期:2020.12.4
An efficient synthesis of β-methylsulfonylated N-heterocycles via FeCl3-catalyzed C(sp3)–H dehydrogenation and C(sp2)–H methylsulfonylation of inactivated cyclic amines with the promotion and participation of inorganic sodium metabisulfite and dicumyl peroxide (DCP) has been developed. Notably, bifunctional DCP acted not only as an oxidant to promote the dehydrogenation but also as a methyl radical
Mechanistic Studies of the Copper-Catalyzed Electrophilic Amination of Diorganozinc Reagents and Development of a Zinc-Free Protocol
作者:Matthew J. Campbell、Jeffrey S. Johnson
DOI:10.1021/ol0702829
日期:2007.4.1
mechanism for the copper-catalyzed amination of diorganozincreagents by O-benzoyl-N,N-dialkylhydroxylamines is supported by following stereochemically defined organometallics through the reaction and by employing the endocyclic restriction test. A copper-catalyzed electrophilic amination of organomagnesium compounds is also described in which the use of zinc halides has been eliminated.
desaturative β-C(sp3)−H acylation of cyclic N-aryl amines has been developed to access the desired β-substituted enamines with excellent levels of chemo- and regioselectivityundermildconditions. This procedure proved to be a powerful route to the late-stage modification of natural products and derivatives.
C(sp<sup>3</sup>)–H dehydrogenation and C(sp<sup>2</sup>)–H alkoxy carbonylation of inactivated cyclic amines towards functionalized N-heterocycles
作者:Yan He、Fang Wang、Xinying Zhang、Xuesen Fan
DOI:10.1039/c6cc10227a
日期:——
A novel and efficient synthesis of tetrahydropyridine-, dihydropyrrole-, and tetrahydroazepine-3-carboxylates via cascade reactions of cyclic amines with CO and alcohols is presented. To our knowledge, this should be the first example in which functionalized N-heterocycles were prepared through Pd-catalyzed C(sp3)-H dehydrogenation and C(sp2)-H carbonylation of cyclic amines.