antibacterial and cytotoxic activity of seven racemic lactams and both enantiomers of flavipucine were evaluated. Of the compounds tested in this study, flavipucine and phenylflavipucine displayed bactericidal activity against Bacillus subtilis. These results indicate that the pyridione epoxide moiety is a pharmacophore for antibacterial activity against B. subtilis. Flavipucine showed cytotoxic activity against
作者:John A. Findlay、Jiri Krepinsky、Anita Shum、C. G. Casinovi、L. Radics
DOI:10.1139/v77-085
日期:1977.2.15
The structure of isoflavipucine 2a, a remarkable rearrangement product of the antibiotic flavipucine 1, is proposed on the basis of spectral data and chemical and mechanistic considerations.
A biomimetic synthesis of naturally occurring lactams rubrobramide, flavipucine, and isoflavipucine is described. The key step is a regioselective Darzens reaction between isobutyl glyoxal and an α‐bromo‐β‐ketoamide. The construction of the core tricyclic ring system of rubrobramide was achieved by a cascade reaction in a single step from an α,β‐epoxy‐γ‐lactam. Furthermore, the absolute configuration