Rapid deprotection and purification of ceftaroline free base from its phosphoramidate prodrug

Contemporary pharmaceutical design often incorporates functional groups to improve the pharmacokinetic/pharmacodynamic profile of a desired active chemical entity. These compounds are known as prodrugs. While prodrug enhancements may improve a medication's clinical utility, they often limit the ability for <i>in vitro</i> testing of the active drug. Published protocols suggest that commercially available phosphatase enzymes can provide a straightforward and cost-effective way to access the active components of phosphoramidate prodrugs. Here, we demonstrate that commercial phosphatases lack reproducibility in generating the active antibiotic ceftaroline from its prodrug ceftaroline fosamil (Teflaro^®). We propose that previously reported successes with phosphatase-mediated conversion are due to the purification of natural ceftaroline fosamil degradation products or batch-dependent isozyme contaminants present in alkaline phosphatases obtained from biological sources. Here, we demonstrate the chemical/thermodegradation to provide a robust, non-enzymatic source of the ceftaroline free base. This efficient method can be readily adapted to expand the availability of deprotected thermostable commercial pharmaceutical compounds for <i>in vitro</i> testing and research purposes.