DMSO is a reaction-solvent choice for selected amine-substitution steps in fluoroquinolone synthesis. Published routes include piperazine-containing transformations related to ciprofloxacin and norfloxacin.
Introducing the amine side chain
In these examples, an amine reacts with a suitable activated quinolone intermediate. DMSO provides the reaction medium, while the amine becomes part of the product structure.
The required amine and substitution pattern differ between fluoroquinolones. For norfloxacin, one documented route reacts a boron-chelated intermediate with piperazine, followed by hydrolysis. The dedicated norfloxacin article explains that step separately.
Evaluate the actual intermediate
Compare conversion, related impurities and isolated quality for the selected substrate. Include hydrolysis or decomplexation where applicable, followed by crystallization, washing and drying.
Set DMSO assay, water and impurity requirements from that process. Review residual-solvent removal downstream and the suitability of any recovered material. Heat and compatibility assessment should cover the reagents and full solvent mixture.
For sourcing, provide YUJI with the fluoroquinolone intermediate step and agreed DMSO specification.