Prostaglandin prodrugs. 5.1 Prostaglandin E2 ethylene ketal.
In order to improve the chemical stability of prostaglanding E2 (2), prostaglanding E2 ethylene ketal (1) was prepred by direct ketalization of 2 with ethylene glycol in benzene. To establish a quantitative assessment of 1 as a chemically stable and orally active prodrug of 2, the hydrolysis of 1 to 2 and the subsequent dehydration of 2 to prostaglandin A2 (3) were followed at 25 degrees C and six pH's ranging from 2.0 to 6.5 by means of a high-pressure liquid chromatographic procedure. Kinetic results clearly indicate that 1 should be quantitively hydrolyzed back to the parent drug 2 dehydration of 2 to 3 are in the order of 1 h and 14 days, respectively. The preliminary data on the biological response after oral administration of 1 appeared to indicate the 1 is bioequivalent to 2.[1]References
- Prostaglandin prodrugs. 5.1 Prostaglandin E2 ethylene ketal. Cho, M.J., Bundy, G.L., Biermacher, J.J. J. Med. Chem. (1977) [Pubmed]
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