Epimerization of benzylpenicilloate in alkaline aqueous solutions.
摘要:
5R, 6R-Benzylpenicilloate (2) epimerized in alkaline equeous solutions to 5S, 6R-benzylpenicilloate (5) via the imine tautomer of benzylpenamaldate (3) rather than the enamine tautomer (4). In the presence of mercury (II) chloride, 2 isomerizes in alkaline aqueous solutions via 4 rather than 3 to afford 5. In both cases, the 5S, 6R-configuration was favored at equilibrium.