Recent publication

2,2ʹ-Bis(arylamino)-1,1ʹ-biaryls as Building Blocks for the Synthesis of Dibenzo[d,f][1,3]diazepines, Dibenzo[d,f][1,3]diazepinones, and Dibenzo[c,e][1,2,7]thiadiazepine 6-oxides
The iron-catalyzed oxidative C–C homocoupling of diarylamines affords 2,2ʹ-bis(arylamino)-1,1ʹ-biaryls which represent crucial synthetic building blocks for an access to a range of sevenmembered heterocyclic ring systems. Reaction with paraformaldehyde, diphenyl carbonate, and diphenyl sulfite as efficient 1,1ʹ-dielectrophiles led to dibenzo[d,f][1,3]diazepines, dibenzo[d,f][1,3]diazepinones, and dibenzo[c,e][1,2,7]thiadiazepine 6-oxides. The synthetic procedures enable short and practical routes to these 1,3-diazepine derivatives under mild reaction conditions and with a high tolerance of various functional groups.
https://doi.org/10.1002/ejoc.202300591