Yamanouchi Institute for Drug Discovery Research, Yamanouchi Pharmaceutical Co. Ltd., 21 Miyukigaoka, Tsukuba, Ibaraki, 305 JAPAN ... Abstract: Thioamides were treated with iodomethane, and then o,o'- diaminobiphenyl or bipyridyl to afford 6-substituted-5H-dibenzo- or dipyrido [ 1,3]diazepines in good yields. ... Dibenzo- and dipyrido[ 1,3]diazepines are of pharmaceutical interest, and ... Dipyrido[ 1,3]diazepines have been reported to have activities on central ...