An efficient and practical method for the synthesis of medicinally important acridines from readily available o-aminoaryl ketones and arylboronic acids was developed using copper(II)-mediated relay reactions that involve intermolecular Chan–Lam cross-coupling and subsequent intramolecular Friedel–Crafts-type reactions. A sole promoter, i.e., Cu(OTf)2, was used; therefore, strongly acidic and basic
Photoinduced Cascade Reaction of Tertiary Amines with Sulfonyl Azides: Synthesis of Amidine Derivatives
作者:Rui Ding、Hui Chen、Yan‐Li Xu、Hai‐Tao Tang、Yan‐Yan Chen、Ying‐Ming Pan
DOI:10.1002/adsc.201900359
日期:2019.8.5
A metal‐free cascade reaction of tertiary amines with sulfonylazides promoted by acridinium salts under blue light irradiation was developed and provided amidine derivatives in moderate to good yields. Enamine was generated from tertiary amine via single‐electron transfer promoted by acridinium salts, and the following [3+2] cyclization with sulfonylazide and CH2N2 release afforded the desired products
蓝光下a啶盐促进的叔胺与磺酰叠氮化物的无金属级联反应得到了开发,并以中等至良好的收率提供了derivatives衍生物。a胺盐通过via啶盐促进的单电子转移从叔胺生成烯胺,随后通过磺酰叠氮化物和CH 2 N 2的释放[3 + 2]环化获得所需的产物。
Visible-Light-Induced Oxidation/[3 + 2] Cycloaddition/Oxidative Aromatization to Construct Benzo[<i>a</i>]carbazoles from 1,2,3,4-Tetrahydronaphthalene and Arylhydrazine Hydrochlorides
作者:Jiaxuan Shen、Nannan Li、Yanjiang Yu、Chunhua Ma
DOI:10.1021/acs.orglett.9b02939
日期:2019.9.6
An efficient synthesis of benzo[a]carbazoles via visible-light-induced tandem oxidation/[3 + 2] cycloaddition/oxidative aromatization reactions was reported. The benzylic C(sp3)-H of tetrahydronaphthalene was activated through visible-light photoredox catalyst with oxygen as the clean oxidant under mild reaction conditions. This protocol proceeds efficiently with broad substrate scope, and the mechanism