July 01, 2022, 07:49:13 PM
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Topic: Oxidation of a sulfide to a sulfone in the presence of a glycoside  (Read 244 times)

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Offline Babcock_Hall

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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

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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 »

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