Abstract
In order to improve aqueous solubility of nocathiacin I ( 1), a potent antibacterial agent, N-demethylation of the amino-sugar moiety was sought. Irradiation of 1 in DMF/CH 2Cl 2 with UV light of 380 nm led to a cyclic product 2, which was hydrolyzed to yield the desired nocathiacin VI ( 3). Treatment of 1 with shorter UV light caused trans–cis isomerization of a c–c double bond.
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