S. Rault et al., A NEW REARRANGEMENT UNDER MICROWAVE-HEATING CONDITIONS - SYNTHESIS OFCYCLOPENTA[B][1,4]BENZODIAZEPINES AND TETRAHYDRODIBENZO[B,F][1,4]DIAZEPINES, Tetrahedron letters, 36(37), 1995, pp. 6673-6674
microwave heating of pyrrolo and pyrido[2,1-c][1,4]benzodiazepine-dion
es in boiling phosphorus oxychloride produced a new rearrangement lead
ing to cyclopenta[b][1,4]benzodiazepines and tetrahydrodibenzo[b,f][1,
4]diazepines respectively.