How is 8-Chloro-5,10-dihydro-11H-dibenzo[b,e][1,4]diazepin-11-one (CAS: 50892-62-1) typically synthesized?

8-Chloro-5,10-dihydro-11H-dibenzo[b,e][1,4]diazepin-11-one can be synthesized through a multi-step process involving the condensation of benzophenone imine with 1,4-diazepine-1,4-dicarboxylic acid, followed by a series of ring closures and chlorination reactions. This synthesis often requires the use of catalysts and high temperatures, with a typical yield of around 70-80%.