2-Chloro-1,3-dimethylimidazolinium Chloride. 3. Utility for Chlorination, Oxidation, Reduction, and Rearrangement Reactions
摘要:
2-Chloro-1,3-dimethylimidazolinium chloride (1), which can act as a powerful dehydrating equivalent to DCC (2), is also applicable to chlorination, oxidation, reduction, and rearrangement under nearly neutral conditions. The utility of 1 for these reactions is described.
Nondirected Copper-Catalyzed Sulfoxidations of Benzylic C–H Bonds
作者:Hao Yu、Zhen Li、Carsten Bolm
DOI:10.1021/acs.orglett.8b00615
日期:2018.4.6
A copper-catalyzed sulfoxidation of benzylic C–H bonds by nondirected oxidative C(sp3)-H activation was developed. The process proceeds via sulfenate anions, which are generated by base-triggered elimination of β-sulfinyl esters and benzyl radicals. The functional group tolerance is high, and the product yields are good.
Copper-catalyzed asymmetric sulfoxidation of aryl benzyl and aryl alkyl sulfides, using aqueous hydrogen peroxide as the oxidant, has been investigated. A relationship between the steric effects of the sulfide substituents and the enantioselectivity of the oxidation has been observed, with up to 93% ee for 2-naphthylmethyl phenyl sulfoxide, in modest yield in this instance (up to 30%). The influence
Herein we reported an efficient palladium-catalyzed enantioselective arylation of both alkyl and aryl sulfenate anions to deliver various chiral sulfoxides in good yields (up to 98%) with excellent enantioselectivities (up to 99% ee) by the use of our developed chiral O,P-ligands (PC-Phos). PC-Phos are easily prepared in shortsteps from inexpensive commercially available starting materials. The single-crystal
Copper-Catalyzed Sulfinyl Cross-Coupling Reaction of Sulfinamides
作者:Mengting Kou、Ziqiang Wei、Zhen Li、Bin Xu
DOI:10.1021/acs.orglett.2c03414
日期:2022.11.25
A copper-catalyzed sulfinyl cross-coupling reaction of sulfinamides with aldehyde-derived N-tosylhydrazones is described. This approach enables facile access for the construction of structurally diverse sulfoxides via novel and efficient S–N/S–Cbond interconversions, features broad substrate scope, and accommodates various functional groups as well as pharmacophores. Moreover, the given sulfinyl cross-coupling
Electro-oxidative coupling of Bunte salts with aryldiazonium tetrafluoroborates: a benign access to unsymmetrical sulfoxides
作者:Saurabh Kumar、Shiv Chand、Krishna Nand Singh
DOI:10.1039/d3ob01955a
日期:——
An electrochemical strategy for the synthesis of unsymmetrical sulfoxides has been explored using Buntesalts and aryldiazonium tetrafluoroborates under constant current electrolysis at room temperature. In addition to being eco-safe and using mild conditions, the present protocol is free from the use of metal/oxidant, and is endowed with a broad substrate scope and good functional group tolerance