Unusual asymmetric oxidation of sulfide; the diastereoselective oxidation of prochiral sulfide-chiral acid salt with hydrogen peroxide without metal
The sulfide 4 was treated with chiral acid in a mixture of toluene and methyl iso-butylketone to precipitate the salt, which reacted with 30% H 2O2 for 3 weeks at rt. The resulting crystals were collected followed by recrystallizatio