Synthesis of 9-deoxo-4'-deoxy-6,9-epoxyerythromycin derivatives: novel and acid-stable motilides |
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Authors: | R Faghih PA Lartey HN Nellans L Seif C Burnell-Curty LL Klein P Thomas A Petersen A Borre T Pagano KH Kim M Heindel YL Bennani JJ Plattner |
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Affiliation: | Pharmaceutical Discovery Division, Abbott Laboratories, Abbott Park, Illinois 60064-3500, USA. |
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Abstract: | In our quest toward the discovery of highly potent and acid-stable motilides, novel 4"-deoxy derivatives of 9-deoxo-6, 9-epoxyerythromycin were designed, synthesized, and evaluated for their gastrointestinal prokinetic activities. These compounds, in their 9R configuration, were more potent than their 6,9-enol ether homologues in inducing well-coordinated smooth muscle contractions in an in vitro rabbit duodenal assay: e.g., (9R), (8S)-9-deoxo-4"-deoxy-3'-N-desmethyl-3'-N-ethyl-6, 9-epoxyerythromycin A (10) and (9R), (8S)-9-deoxo-4"-deoxy-3'-N-desmethyl-3'-N-ethanol-6, 9-epoxyerythromycin A (15) had a pED50 of 8.54 and 8.11 compared to a pED50 of 7.22 for compound 2 (ABT-229). Reduction of the 6,9-enol ether, which was aimed at improving the acid stability, afforded the most stable motilides to date with t1/2 of 5.5 h for 10 and 15. Compounds 10 and 15 bind specifically to rabbit antral smooth muscle motilin receptors with pIC50 values of 8.52 and 8.70. |
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