53439-66-0Relevant academic research and scientific papers
Preparation of Quaternary Centers via Nickel-Catalyzed Suzuki-Miyaura Cross-Coupling of Tertiary Sulfones
Ariki, Zachary T.,Maekawa, Yuuki,Nambo, Masakazu,Crudden, Cathleen M.
supporting information, p. 78 - 81 (2018/01/17)
We describe the development of a nickel-catalyzed Suzuki-Miyaura cross-coupling of tertiary benzylic and allylic sulfones with arylboroxines. A variety of tertiary sulfones, which can easily be prepared via a deprotonation-alkylation route, were reacted to afford symmetric and unsymmetric quaternary products in good yields. We highlight the use of either BrettPhos or Doyle's phosphines as effective ligands for these challenging desulfonative coupling reactions. The utility of this methodology was demonstrated in the concise synthesis of a vitamin D receptor modulator analogue.
The Mechanism of Enzymatic and Biomimetic Oxidations of Aromatic Sulfides and Sulfoxides
Baciocchi, Enrico,Lanzalunga, Osvaldo,Marconi, Francesco
, p. 9771 - 9774 (2007/10/02)
Biomimetic and enzymatic oxidations of benzyl sulfides and sulfoxides lead to products (sulfoxides or sulfones) different from those obtained with bona fide electron transfer oxidations (products of C-H and/or C-S bond cleavage), which suggests the operation of an oxygen transfer machanism.
Electron-Transfer Substitution Reactions: Leaving Groups
Kornblum, Nathan,Ackermann, Peter,Manthey, Joseph W.,Musser, Michael T.,Pinnick, Harold W.,et al.
, p. 1475 - 1481 (2007/10/02)
A number of groups that do not participate in SN2 displacement processes are able to function as leaving groups in electron-transfer chain reactions at room temperature; such groups include azide, sulfone, ethers, nitro, quaternary ammonium ions, esters, and thioethers.Even carbanions are able to function as leaving groups as can be seen from fragmentation of carbon-carbon bonds.
Nucleofugality of the Sulfinate Group in Carbocation-Forming Processes
Creary, Xavier
, p. 5080 - 5084 (2007/10/02)
The solvolytic reactivity of a variety of sulfones and sulfinate esters has been determined which allows one to place the sulfinate leaving group in a relative nucleofugality scale.Cumyl trifluoromethyl sulfone (1) reacts in a variety of solvents to give substitution products.The mOTs value of 0.82 is indicative of the involvement of the cumyl cation (9) formed in kc process.In terms of rate, 1 is 170 times less reactive than cumyl chloride but 286 times more reactive than cumyl p-nitrobenzoate.The analogous cumyl methyl sulfone (2) and cumyl phenyl sulfone (3) solvolyze approximately 107 times more slowly than 1.The sulfinate esters cumyl methanesulfinate (6) and cumyl p-toluenesulfinate (7) are considerably more reactive than the analogous sulfones.Methanolysis of 6 was also subject to acid catalysis, where a mechanism analogous to the AAL1 mechanism of hydrolysis of esters of carboxylic acids was suggested.The less hindered α-phenethyl trifluoromethyl sulfone (4) and p-methoxybenzyl trifluoromethyl sulfone (5) solvolyzed at rates that approached those of the analogous p-nitrobenzoates.This was indicative of the importance of relief of steric congestion in solvolyses of the more hindered tertiary sulfone 1.
