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。
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
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
FeCl<sub>3</sub>
-Catalyzed Cascade Reactions of Cyclic Amines with 2-Oxo-2-arylacetic Acids toward Furan-2(5<i>H</i>
)-one Fused <i>N,O</i>
-Bicyclic Compounds
作者:Xiaonan Shi、Yan He、Xinying Zhang、Xuesen Fan
DOI:10.1002/adsc.201701053
日期:2018.1.17
and efficient synthesis of furan‐2(5H)‐one fused N,O‐containing bicyclic compounds via the cascade reactions of N‐aryl substituted cyclic amines with 2‐oxo‐2‐arylacetic acids is presented. Mechanistically, the formation of the title compounds is initiated by the in situ formation of a cyclic enamine intermediate via FeCl3/di‐tert‐butyl peroxide (TBP)/oxygen (O2)‐promoted C(sp3)−H dehydrogenation of saturated