Diazabicycloalkanes with nitrogen atoms in the nodal positions. 21. Heteroatom-promoted lithiation of benzo[b]-1,4-diazabicyclo[2.2.2]octene and introduction of substituents into the annelated benzene ringA. A. Gall'; A. S. Trachum; V. A. Romantsev; G. V. Shishkin · 1991