Base-catalyzed Isomerism in Elfamycin Antibiotics Structures of Ganefromycins ε and ε_1
1995
The structures of ganefromycins e (2a) and e 1 (2b) have been determined by spectroscopic techniques. The compounds are isomeric deoxygenated precursors of the parent antibiotics ganefromycins α and β. The nature of the isomerism was determined by chemical interconversion experiments and spectroscopic analysis to be a change in configuration at C-21. Evidence is provided for other cases of this type of isomerism in the elfamycin class of antibiotics.
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