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New Steroidal Anti-Inflammatory Antedrugs: 21-Thioalkylether Derivatives of Methyl 16-Prednisolone Carboxylates

[ Vol. 3 , Issue. 6 ]


M. Omar F. Khan, Kwan K. Park, Sharye N. Glynn and Henry J. Lee   Pages 572 - 575 ( 4 )


Antedrug approach of the corticosteroids has been described as a fundamentally sound approach for the development of safer anti-inflammatory steroids devoid of systemic side effects. In our continued efforts under the antedrug paradigm, we have recently extended this effort to synthesize the 21-thioalkylether derivatives of methyl 16- prednisolonecarboxylates. The 21-mesylate of the methyl-16-perdnisolonecarboxylates and 9-fluoro-17-dehydro methyl 16-prednisolonecarboxylate were reacted with Na-thioalkoxides to furnish the desired thioalkylethers in 60-75% yields. These newly synthesized thioalkylether steroid series were tested for their in vitro metabolism and corticosteroid receptor binding affinity. They were metabolized in predictable manner to inactive 16-carboxylic acids. All the newly synthesized antedrugs showed lowered glucocorticoid receptor binding affinity than prednisolone indicating that the replacement of the 21-OH function with thioalkylether of the 16-prednisolone carboxylate esters decreases their receptor binding affinity.


Antedrug, thioalkylether, anti-inflammatory steroids, dissociated steroids, receptor binding


College of Pharmacy and Pharmaceutical Sciences, Florida A&M University, Tallahassee, FL 32307,USA.

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