A facile approach for new dibenzo [b,f][1,5] diazocinones

Abstract

The synthesis of new eight-membered cycle dibenzo[b,f][1,5]-diazocine-6(5H)-one derivatives 11, 12 was developed. The key step in this synthesis was the intramolecular cyclization of the amino aldehyde precursors 9,10 obtained by a selective reduction of the nitro benzamides 7, 8.