March 28, 2024, 09:20:22 AM
Forum Rules: Read This Before Posting


Topic: Oxidation of a sulfide to a sulfone in the presence of a glycoside  (Read 1723 times)

0 Members and 1 Guest are viewing this topic.

Offline Babcock_Hall

  • Chemist
  • Sr. Member
  • *
  • Posts: 5594
  • Mole Snacks: +319/-22
We have used Oxone for thioether oxidations in the past, but I am concerned that the acidity of this reagent may cause hydrolysis of our glycosididic bond (we have an acetyl-protected glycoside with a spacer between it and the sulfur).  I have seen mCPBA used in a 2005 paper for a very similar transformation; therefore, it would be my first choice.  I have also seen dimethyl dioxirane used in a similar reaction.  I have also read that Oxone can be buffered with borate (I can provide a reference if anyone is interested).  The other oxidants that might be tried are NaWO4•2H2O/H2O2 and KMnO4.  My question is why doesn't mCPBA cause cleavage of the glycosidic bond.  Is it because the reaction is done under anhydrous conditions?

Offline Babcock_Hall

  • Chemist
  • Sr. Member
  • *
  • Posts: 5594
  • Mole Snacks: +319/-22
Re: Oxidation of a sulfide to a sulfone in the presence of a glycoside
« Reply #1 on: April 21, 2022, 08:28:48 AM »
The reference to buffering Oxone with borate to about pH 5 is Trost BM, Acemoglu M Tet Lett 1989 30 1495.  Right now my thoughts are to try mCPBA first; if that fails, I would try buffered Oxone second.
« Last Edit: April 21, 2022, 09:24:55 AM by Babcock_Hall »

Offline Babcock_Hall

  • Chemist
  • Sr. Member
  • *
  • Posts: 5594
  • Mole Snacks: +319/-22
Re: Oxidation of a sulfide to a sulfone in the presence of a glycoside
« Reply #2 on: April 28, 2023, 06:30:11 AM »
We were successful in using mCPBA to convert a sulfide to a sulfone using mCPBA in the presence of a glycosidic bond.  Besides mCBPA, there is one other reagent in the literature that has been shown to be capable of this transformation, which IIRC is dimethyldioxirane.

Sponsored Links