Synthesis of fused β-lactams by copper-promoted intramolecular aromatic substitution
作者:Roger Joyeau、Yann Dugenet、Michel Wakselman
DOI:10.1039/c39830000431
日期:——
Competition between intramoleculararomaticsubstitution and elimination of the C-4 substituent occurs on heating the monocyclic azetidinones (3) in the presence of copper powder; steric hindrance favours the formation of the tricyclic azetidinones (4).