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
Practical and regioselective amination of arenes using alkyl amines
作者:Alessandro Ruffoni、Fabio Juliá、Thomas D. Svejstrup、Alastair J. McMillan、James J. Douglas、Daniele Leonori
DOI:10.1038/s41557-019-0254-5
日期:2019.5
these molecules are assembled through the stepwise introduction of a reactivity handle in place of an aromatic C-H bond (that is, a nitro group, halogen or boronic acid) and a subsequent functionalization or cross-coupling. Here we show that aromaticamines can be constructed by direct reaction of arenes and alkyl amines using photocatalysis, without the need for pre-functionalization. The process
Synthesis of α-Formylated <i>N</i>-Heterocycles and Their 1,1-Diacetates from Inactivated Cyclic Amines Involving an Oxidative Ring Contraction
作者:Fang Wang、Yan He、Miaomiao Tian、Xinying Zhang、Xuesen Fan
DOI:10.1021/acs.orglett.7b04029
日期:2018.2.2
cascade reactions of N-arylpiperidines or N-arylazepanes is presented. Mechanistically, the formation of the title compounds involves an unprecedented oxidative ring contraction of inactivated cyclic amines via Cu(OAc)2/KI/O2-promoted oxidativecleavage and reformation of the C–N bond. Interestingly, when PhI(OAc)2 was used in place of KI, 1,1-diacetates of the corresponding aldehydes were directly obtained
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。