Exploring Tandem Ruthenium-Catalyzed Hydrogen Transfer and S<sub>N</sub>Ar Chemistry
作者:Kurt Polidano、Benjamin G. Reed-Berendt、Anaïs Basset、Andrew J. A. Watson、Jonathan M. J. Williams、Louis C. Morrill
DOI:10.1021/acs.orglett.7b03441
日期:2017.12.15
A hydrogen-transfer strategy for the catalytic functionalization of benzylic alcohols via electronic arene activation, accessing a diverse range of bespoke diaryl ethers and aryl amines in excellent isolated yields (38 examples, 70% average yield), is reported. Taking advantage of the hydrogen-transfer approach, the oxidation level of the functionalized products can be selected by judicious choice
Benzylic Aroylation of Toluenes Mediated by a LiN(SiMe<sub>3</sub>)<sub>2</sub>/Cs<sup>+</sup> System
作者:Yuanyun Gu、Zhen Zhang、Yan-En Wang、Ziteng Dai、Yaqi Yuan、Dan Xiong、Jie Li、Patrick J. Walsh、Jianyou Mao
DOI:10.1021/acs.joc.1c02446
日期:2022.1.7
Chemoselective deprotonative functionalization of benzylic C–H bonds is challenging, because the arene ring contains multiple aromatic C(sp2)–H bonds, which can be competitively deprotonated and lead to selectivity issues. Recently it was found that bimetallic [MN(SiMe3)2 M = Li, Na]/Cs+ combinations exhibit excellent benzylic selectivity. Herein, is reported the first deprotonative addition of toluenes
作者:Ming Ming Yu、Xia Li、Miao Luan、Jun Na Gao、Qiu Zhi Shi、Ming Sheng Tang、Liu He Wei
DOI:10.1016/j.cclet.2010.04.005
日期:2010.10
Abstract An improved strategy for the synthesis of 3,3′-(oxy-p-phenylene)bis(2,4,5-triphenylcyclopentadienone) was developed, which includes three steps: Friedel–Crafts reaction, oxidation and condensation. Importantly, the use of KMnO4 made the second step simple and efficient, which has potential application to synthesis of bis(cyclopentadienone)s. The course of oxidation has been confirmed by isolated
A photocatalytic formal [3+2] cycloaddition of 2H‐azirines with alkynes has been achieved under irradiation by visiblelight in the presence of organic dye photocatalysts. This transformation provides efficient access to highly functionalized pyrroles in good yields and has been applied to the synthesis of drug analogues. A primary trial of photocascade catalysis merging energy transfer and redox neutral
在有机染料光催化剂的存在下,在可见光照射下,已实现了2 H H叠氮基与炔烃的光催化形式[3 + 2]环加成反应。这种转化提供了以高收率高效获得高度官能化吡咯的途径,并已应用于药物类似物的合成。光级联催化合并能量转移和氧化还原中性反应的初步试验显示是成功的。
[3 + 2]-Cycloaddition of 2<i>H</i>-Azirines with Nitrosoarenes: Visible-Light-Promoted Synthesis of 2,5-Dihydro-1,2,4-oxadiazoles
A formal [3 + 2]-cycloaddition reaction of 2H-azirines with nitrosoarenes has been achieved under irradiation by visible light with the assistance of organic dye photoredox catalyst. This method utilizes nitrosoarenes as efficient radical acceptors and provides a green and powerful method for a series of biologically important 1,2,4-oxadiazole derivatives in moderate to good yields.