AbstractWe report the Heck cross‐coupling of notoriously unreactive, but synthetically valuable olefins: vinyl sulfoxides, vinyl sulfones, and vinyl sulfides. Key findings include the importance of the sterically hindered (tri‐tert‐butyl)phosphine ligand and the unique effectiveness of triethylamine as the base. The method is general, E‐selective, and can be used to synthesize disubstituted or trisubstituted olefins through simple adjustments of stoichiometry.magnified image
Photoredox-Mediated Synthesis of Functionalized Sulfoxides from Terminal Alkynes
作者:Jaswant Kumar、Ajaz Ahmad、Masood Ahmad Rizvi、Majid Ahmed Ganie、Chhavi Khajuria、Bhahwal Ali Shah
DOI:10.1021/acs.orglett.0c02055
日期:2020.7.17
A photoredox-mediated protocol for the synthesis of α-alkoxy-β-ketosulfoxides and α,β-dialkoxysulfoxides using alkynes, thiol, and alcohols is reported. This work presents a rare single-step synthesis of α-substituted sulfoxides, involving tandem introduction of a thiol and alcohol as a key enabling advancement. Furthermore, the method can be easily employed to access vinyl sulfoxides and β-ketosulfoxides
A new synthetic approach to aryl and alkyl α,β-unsaturated sulfoxides is reported. The reaction has been optimized with respect to solvent, temperature, and ratio of reagents. The described procedure allows the synthesis of the title compounds in good yields (71-82%) starting from readily available reagents, in a cost-effective procedure.