DMSO activation in Pseudo-Swern reaction
Mechanism + Description
While oxalyl chloride, TFAA, and Pyr-SO3 are common choices for DMSO activation to facilitate alcohol oxidation, other variations are available. Some less referenced but equally beneficial reagents include acetic anhydride, P2O5, and trimethylchlorosilane. Ac2O would be a cheaper and more environmentally friendly alternative to TFAA. Reaction of electrophiles like TFFA and P2O5 with DMSO can be highly exothermic.
Goodman, S. N.; Dai, Q.; Wang, J.; Clark, W. M., Jr. A Scalable Oxidation for the Final Stage of Synthesis of Cathepsin K Inhibitor SB-462795. Org. Process Res. Dev. 2011, 15 (1), 123–130.
Relevant scale up example