1093253-55-4Relevant articles and documents
Addition of sulfonic acids to terminal alkynes catalyzed by a rhodium complex: Ligand concentration-controlled reaction selectivity
Yang, Yong,Moschetta, Eric G.,Rioux, Robert M.
, p. 3005 - 3013 (2013)
A Rh-catalyzed process for the regioselective formation of vinyl sulfonate esters in moderate to high yields through the hydrosulfonation of alkynes with sulfonic acids has been developed. Our synthetic approach is capable of adding a variety of alkynes to a set of sulfonic acids and is amenable to different phosphorus ligands, solvents, and Rh precursors. We control the chemo- and regioselectivity of the reaction to the Markovnikov vinyl sulfonate ester by tuning the concentration of the exogenous ligand, PPh3, which forms the active Rh-P species insitu. At lower PPh3 concentrations, the reaction favors the formation of vinyl sulfonate esters, whereas at higher PPh3 concentrations, the reaction favors the formation of vinylphosphonium salts. We perform Hammett analyses and kinetic isotope effect experiments to determine the steps of the catalytic mechanism. Reaction data for substituted acetylenes indicates syn and anti addition occur across the triple bond. Experiments performed with the vinylphosphonium salt as the exogenous ligand determined that the formation of the salt was not a necessary step in the catalytic mechanism for the direct formation of the vinyl sulfonate esters.
Photoinduced rearrangement of vinyl tosylates to β-ketosulfones
Xie, Lili,Zhen, Xiaomeng,Huang, Shuping,Su, Xiaolong,Lin, Mai,Li, Yi
supporting information, p. 3530 - 3534 (2017/08/15)
We developed a photoinduced radical fragmentation and rearrangement of vinyl tosylates that enables efficient formation of β-ketosulfones. This process is based on the photoinitiated homolysis of vinyl tosylate to release a sulfinyl radical from the tosyl group and the subsequent addition of a sulfinyl radical to another vinyl tosylate to form the desired β-ketosulfones. This simple protocol features a broad scope with both aromatic and aliphatic substrates, convenient reagents and operating systems.
