DMSO is a solvent option in a published method for preparing ester derivatives of nonsteroidal anti-inflammatory drugs. The starting materials include existing NSAIDs such as ketoprofen; the process modifies the drug rather than making the parent API from its initial building blocks.
The derivative-forming step
The method converts an NSAID carboxylic acid into its sodium or potassium salt in a polar solvent such as DMSO or DMF. The salt then reacts with beta-butyrolactone to form an ester-linked derivative containing oligomeric hydroxybutyrate units.
Here DMSO provides the reaction medium. It is not the source of the ester-linked carrier. The reaction is a specific derivatization example, not a general ketoprofen manufacturing route.
What to evaluate
Solvent and water content should be assessed together with salt formation, reaction progress and the distribution of derivative products. The required analytical tests depend on the derivative being prepared.
Include purification and solvent removal when comparing a DMSO source. Incoming solvent purity does not establish the residual DMSO level or composition of the isolated derivative. Thermal and compatibility assessment should cover the base, lactone and complete reaction mixture.
If this type of derivatization is your application, share the required solvent specification with YUJI for a sourcing discussion.