Systematic Evaluation of Sulfoxides as Catalysts in Nucleophilic Substitutions of Alcohols
作者:Sebastian Motsch、Christian Schütz、Peter H. Huy
DOI:10.1002/ejoc.201800907
日期:2018.9.9
Out of an in‐depth study of a range of sulfinyl compounds in the transformation of alcohols into chloro alkanes emerged (2‐methoxyphenyl)methyl sulfoxide as optimal Lewis base catalyst. While this catalyst allowed the synthesis of benzylic chlorides in turn‐over numbers up to 50, aliphatic alcohols are non‐suitable substrates due to competing Pummerer rearrangement.
Exposure of sulfides and sulfoxides to trifluoromethanesulfonylimino(aryl)‐λ3‐bromane in dichloromethane at 0 °C results in a facile transfer of the sulfonylimino group to sulfur atoms and affords N‐triflylsulfilimines and ‐sulfoximines in high yields under transition‐metal‐free conditions. Imination of (R)‐methyl p‐tolyl sulfoxide proceeded with predominant retention of configuration at the stereogenic
Highly Enantioselective Oxidation of Sulfides to Sulfoxides by a New Oxaziridinium Salt
作者:R. E. del Río、B. Wang、S. Achab、L. Bohé
DOI:10.1021/ol0702573
日期:2007.6.1
The new oxaziridinium salt 5 (R2 = TBDPS) is an effective reagent for the highly enantioselective oxidation of sulfides to sulfoxides with up to >99% ee and good yields. As such, it represents a new valuable nonmetallic alternative to the existing methods for asymmetric sulfoxidation.
New phosphine-sulfide and phosphine-sulfoxide ligands were synthesized and tested in allylic alkylation. Their coordination mode with Palladium have been studied by analysis of the corresponding X-ray crystallographic structures. The most efficient ligands were prepared in enantiomerically pure form and were applied to the Pd-catalyzed asymmetric allylic alkylation providing enantioselectivities up
Straightforward Access to Thiocyanates via Dealkylative Cyanation of Sulfoxides
作者:Uroš Todorović、Immo Klose、Nuno Maulide
DOI:10.1021/acs.orglett.1c00460
日期:2021.4.2
Thiocyanates, versatile building blocks in organic synthesis, are shown to be easily accessible via an interrupted Pummerer reaction of sulfoxides. This facile dealkylative functionalization proceeds under mild conditions through electrophilic activation of the sulfoxide partner. The resulting thiocyanate itself can serve as a handle for diversification in a straightforward one-potprocedure.