1,2-Diamines of arenes or hetarenes as well as certain monoamines in the heterocyclic series react as dinucleophiles with l,3-diphenyl-2-propen-1-one (chalcone). A cycloaddition takes place which leads to fused 7- or 6-membered ring systems, namely derivatives of diazepine (Schemes 1-3, 5-9), oxazepine (Scheme 4), pyridine (Schemes 10, 12, 14) and pyrimidine (Scheme 11).