SYNTHESIS OF PYRROLO[1,2- a ][1,6]BENZODIAZONINES FROM PYRROLO[1,2- a ][1,4]BENZODIAZEPINES AND ALKYNES CONTAINING ELECTRON-ACCEPTOR SUBSTITUENTS
It has been established that the reaction of pyrrolo[1,2-a][1,4]benzodiazepines with activated alkynes gives pyrrolo[1,2-a][1,6]benzodiazonines as the products of diazepine ring expansion. In the case of pyrrolo[1,2-a][1,4]benzodiazepine, substituted with formyl group at the pyrrole ring, both expansion and cleavage of the diazepine fragment can occur. Authors: L. G. Voskressensky, T. N. Borisova, M. I. Babakhanov, T. M. Chervyakova, A. A. Titov, A. V. Butin, T. A. Nevolina, V. N. Khrustalev, and A. V. Varlamov. English Translation in Chemistry of Heterocyclic Compounds , 2013, 49 (7), pp 1024-1032 http://link.springer.com/article/10.1007/s10593-013-1340-z