TANDEM TRANSFORMATIONS OF TETRAHYDROPYRROLO[3,2-C]PYRIDINES UNDER THE ACTION OF DIMETHYL ACETYLENEDICARBOXYLATE. A NOVEL ROUTE TO PYRROLO[2,3-D] AZOCINES Статья Voskressensky L.G., Borisova T.N., Vorob'eva T.A., Chernyshev A.I., Varlamov A.V. Russian Chemical Bulletin. Том 54. 2005. С. 2594-2601