Abstract
Desmethyl erythronolides have emerged as macrolide targets that may prove effective against resistant bacteria. A five-step sequence to 4,10-didesmethyl (9S)-dihydroerythronolide A (1) from known cyclic bis[allene] 13 is reported. Key structural and mechanistic aspects of the synthesis are discussed along with catalytic allene osmylation. An improved route to 13 is also described.
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