o-halogenobenzyl-4-alkenyl-β-lactams can be prepared both in the racemic form and in optically pure form using the ketene–imine cyclization. These 2-azetidinone-tethered haloarenes were used for the regio- and stereoselective preparation of benzofused tricyclicβ-lactams including benzocarbapenems and benzocarbacephems via intramolecular aryl radical cyclisation.
The asymmetric synthesis of 2,3-benzocarbapenems by intramolecular aryl radical cyclizations
作者:Benito Alcaide、Angel M. Moreno、Alberto Rodríguez-Vicente、Miguel A. Sierra
DOI:10.1016/0957-4166(96)00271-6
日期:1996.8
Racemic and enantiomerically pure 2,3-benzocarbapenems 1 are obtained in good yields by the tin-mediated, intramolecular aryl radicalcyclizations of the readily available 4-alkenyl-N-(2-halogenophenyl)-β-lactams 2.