By combining “N-chlorosuccinimide (NCS)” as the safe chlorine source with “Acr+-Mes” as the photocatalyst, we successfully achieved benzylic C–H bond chlorination under visible light irradiation. Furthermore, benzylic chlorides could be converted to benzylic ethers smoothly in a one-pot manner by adding sodium methoxide. This mild and scalable chlorination method worked effectively for diverse toluene
Cu-Catalyzed Site-Selective Benzylic Chlorination Enabling Net C–H Coupling with Oxidatively Sensitive Nucleophiles
作者:Marco A. Lopez、Joshua A. Buss、Shannon S. Stahl
DOI:10.1021/acs.orglett.1c04038
日期:2022.1.21
Site-selective chlorination of benzylic C–H bonds is achieved using a CuICl/bis(oxazoline) catalyst with N-fluorobenzenesulfonimide as the oxidant and KCl as a chloride source. This method exhibits higher benzylic selectivity, relative to established chlorination protocols, and is compatible with diverse alkyl arenes. Sequential benzylic C–H chlorination/nucleophilic substitution affords C–O, C–S,
Sulphide as a leaving group: highly stereoselective bromination of alkyl phenyl sulphides
作者:Daniele Canestrari、Caterina Cioffi、Ilaria Biancofiore、Stefano Lancianesi、Lorenza Ghisu、Manuel Ruether、John O'Brien、Mauro F. A. Adamo、Hasim Ibrahim
DOI:10.1039/c9sc03560e
日期:——
A conceptionally novel nucleophilic substitution approach to synthetically important alkyl bromides is presented. Using molecular bromine (Br2), readily available secondary benzyl and tertiary alkyl phenyl sulphides are converted into the corresponding bromides under exceptionally mild, acid- and base-free reaction conditions. This simple transformation allows the isolation of elimination sensitive
Oxetanes. VII. Synthesis from 1,3-Diols. Reactions of Oxetanes and of 1,3-Butanediol with Hydrogen Chloride, Hydrogen Bromide and Acetyl Chloride<sup>1,2</sup>
作者:Scott Searles、Kenneth A. Pollart、Frank Block
DOI:10.1021/ja01561a047
日期:1957.2
Bakker,B.H. et al., Recueil des Travaux Chimiques des Pays-Bas, 1976, vol. 95, p. 274 - 277