K. Matsuda et al., ALTERNATIVE SYNTHESIS OF DIBENZO[1,3]DIAZEPINES AND DIPYRIDO[1,3]DIAZEPINES FROM THIOAMIDES AND O,O'-DIAMINOBIARYLS, Synthetic communications, 27(14), 1997, pp. 2393-2402
Thioamides were treated with iodomethane, and then o,o'-diaminobipheny
l or bipyridyl to afford 6-substituted-5H-dibenzo- or dipyrido [1,3]di
azepines in good yields.