| -protected azapenams were synthesized by the photolysis of chromium carbene complexes in the presence of imidazolines. Upon deprotection, these azapenams underwent an acid-catalyzed dimerization reaction to afford tetraazamacrocycles. Crossing experiments verified the reversibility of the dimerization process under acidic conditions. A crossing reaction with a dihydrobenzazepine was also successful, producing a novel "hybrid" triazamacrocycle.;Carbene complexes bearing substituted aromatic rings were synthesized by two different methods. Upon photolysis in the presence of ZnCl;A number of... |
