Author's Organization:Faculty of Pharmaceutical Sciences, Osaka University Faculty of Pharmaceutical Sciences, Osaka University Faculty of Pharmaceutical Sciences, Osaka University
η-Pyrromycinone (I), η-pyrromycinonic acid (XIII) and η-pyrromycinone trimethyl ether (IX) were synthesized by a series of reactions shown in Chart 1. The syntheses provide unequivocal confirmations for their structures.