提出了一种由N-芳基哌啶或N-芳基氮杂环庚烷的级联反应合成吡咯烷-2-甲醛或四氢吡啶-2-甲醛的新方法。从机理上讲,标题化合物的形成涉及通过Cu(OAc)2 / KI / O 2促进的氧化裂解和C–N键的重整,使灭活的环状胺发生前所未有的氧化环收缩。有趣的是,当用PhI(OAc)2代替KI时,可以高效地直接获得相应醛的1,1-二乙酸酯。据我们所知,这是区域选择性C(sp 3)–H键功能化和C(sp 3)–使用铜盐和氧使饱和环胺的N键活化。
An Efficient and Simple Aqueous N-Heterocyclization of Aniline Derivatives: Microwave-Assisted Synthesis of <i>N</i>-Aryl Azacycloalkanes
作者:Yuhong Ju、Rajender S. Varma
DOI:10.1021/ol050683t
日期:2005.6.1
[reaction: see text] An efficient and clean synthesis of N-aryl azacycloalkanes from alkyl dihalides and aniline derivatives has been achieved using microwave irradiation in an aqueous potassium carbonate medium. The phase separation can simplify the product isolation and reduce usage of volatile organic solvents.
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.
Direct α-Alkenylation of Cyclic Amines with Maleimides through Fe(III)-Catalyzed C(sp<sup>3</sup>)–H/C(sp<sup>2</sup>)–H Cross Dehydrogenative Coupling
作者:Fang Wang、Qianting Zhou、Xinying Zhang、Xuesen Fan
DOI:10.1021/acs.joc.1c01198
日期:2021.9.3
a novel and efficient α-C(sp3)–H alkenylation of cyclic amines with maleimides. Mechanistically, this C(sp3)–H/C(sp2)–H cross dehydrogenative coupling (CDC) reaction involves a cascade procedure including oxidative α-amino radical formation from the cyclic amine substrate and nucleophilicaddition of the in situ formed α-amino radical onto the electron-deficient carbon–carbon double bond of maleimide
Regioselective Synthesis of Acylated <i>N</i>-Heterocycles via the Cascade Reactions of Saturated Cyclic Amines with 2-Oxo-2-arylacetic Acids
作者:Xiaonan Shi、Xi Chen、Muhua Wang、Xinying Zhang、Xuesen Fan
DOI:10.1021/acs.joc.8b00805
日期:2018.6.15
in this cascade process, the copper catalyst is believed to play a crucial role not only in dehydrogenation but also in the decarboxylation and cross coupling reaction. To the best of our knowledge, this is the first example in which different classes of acylated N-heterocycles were directly prepared from the readily available saturated cyclic amines by using 2-oxo-2-arylacetic acids as the noncorrosive