Add time:08/01/2019         Source:sciencedirect.com

Synthetic studies are reported in the erythromycin analogue area. Reaction of trifluoromethyl hypofluorite (CF3OF) with 8,9-anhydroerythronolide A 6,9-hemiketal (1) or 8,9-anhydroerythronolide B 6,9-hemiketal (2) afforded, as major product, (8S)-8-fluoroerythronolide A 6,9;9,ll-spiroketal (3) or (8S)-8-fluoroerythronolide B 6,9;9,ll-spiroketal (4) and, as minor product, (8S)-8-fluoroerythronolide A (5) or (8S)-8-fluoroerythronolide B (6). Hydrolysis of 3 in boiling aqueous acetic acid gave 5, 9,10-anhydro-(8S)-8-fluoroerythronolide A 6,9-hemiketal (7), (8S)-8-fluoroerythronolide A 5,9;9,12-spiroketal (9) and 5,8-epoxy-8-epi-erythronolide A (10). Analogous range of products was obtained by acid hydrolysis of 4

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