@article {45752, title = {Catalyst-free oxidation of sulfides to sulfoxides and diethylamine catalyzed oxidation of sulfides to sulfones using oxone as an oxidant}, journal = {Research on Chemical Intermediates}, volume = {43}, year = {2017}, month = {DEC}, pages = {6875-6888}, type = {Article}, abstract = {

We describe here our journey from the failure of our attempts in controlled oxidation of sulfides to sulfoxides using an Oxone(A (R))-KBr combination to our success in the development of a catalyst-free protocol for the oxidation of sulfides to sulfoxides using Oxone as an oxidant. We also describe the failure of our attempts at the oxidation of sulfides to sulfones using an excess of Oxone-KBr as well as Oxone, and our success towards the development of a rapid, scalable and chromatography-free protocol for the oxidation of sulfides to sulfones using diethylamine-Oxone as an unprecedented catalyst-oxidant combination. [GRAPHICS] .

}, keywords = {diethylamine, organocatalysis, Oxidation, Oxone, Sulfones, Sulfoxides}, issn = {0922-6168}, doi = {10.1007/s11164-017-3026-0}, author = {Kupwade, R. V. and Khot, S. S. and Lad, U. P. and Desai, U. V. and Wadgaonkar, P. P.} } @article {43992, title = {Erratum to: catalyst-free oxidation of sulfides to sulfoxides and diethylamine catalyzed oxidation of sulfides to sulfones using oxone as an oxidant}, journal = {Research on Chemical Intermediates}, volume = {44}, year = {2018}, month = {FEB}, pages = {1437{\textendash}1437}, type = {Journal Article}, abstract = {

We describe here our journey from the failure of our attempts in controlled oxidation of sulfides to sulfoxides using an Oxone{\textregistered}{\textendash}KBr combination to our success in the development of a catalyst-free protocol for the oxidation of sulfides to sulfoxides using Oxone as an oxidant. We also describe the failure of our attempts at the oxidation of sulfides to sulfones using an excess of Oxone{\textendash}KBr as well as Oxone, and our success towards the development of a rapid, scalable and chromatography-free protocol for the oxidation of sulfides to sulfones using diethylamine{\textendash}Oxone as an unprecedented catalyst{\textendash}oxidant combination.

}, keywords = {diethylamine, organocatalysis, Oxidation, Oxone, Sulfones, Sulfoxides}, doi = {10.1007/s11164-017-3137-7}, author = {Kupwade, R. V.}, editor = {Khot, S. S.} } @article {48365, title = {K3PO4-promoted cycloannulation of (E)-beta-Iodovinyl Sulfones with ortho-Hydroxy-chalcones/cinnamates for the synthesis of 2,3,4-trisubstituted 4h-benzopyran derivatives}, journal = {Advanced Synthesis \& Catalysis}, volume = {364}, year = {2022}, month = {DEC }, pages = {4080-4087}, type = {Article}, abstract = {

K3PO4-mediated cycloannulation of (E)-beta-iodovinyl sulfones with ortho-hydroxy chalcones/ortho-hydroxy cinnamates has been realized to access 2,3,4-trisubstituted-4H-benzopyran derivatives. A metal-free tandem oxa-Michael addition and cycloannulation allows the diversity-oriented synthesis of the corresponding 3-sulfonyl-4H-benzopyrans in good to high yields. More importantly, one-pot three-component reaction between (E)-beta-iodovinyl sulfones, 2-hydroxybenzaldehydes, and phosphonium ylides has been established for the synthesis of 4H-chromene derivatives in moderate to good yields. Notably, this metal-free process features a broad substrate scope and easy elaboration into numerous multifaceted chromene products, including bioactive estrone-derivative. The present protocol is sustainable at the gram scale reactions, and post-synthetic applications were also demonstrated. A plausible mechanism is also presented on the basis of existing experimental results.

}, keywords = {(E)-beta-Iodovinyl sulfones, Benzopyrans, Cycloannulation, ortho-Hydroxy Chalcones, Sulfones}, issn = {1615-4150}, doi = {10.1002/adsc.202200763}, author = {Reddy, Raju Jannapu and Kumar, Jangam Jagadesh and Krishna, Gamidi Rama} }