TRANSFORMATIONS OF 2-TRIFLUOROACETYL-4,5,6,7-TETRAHYDRO-1H-PYRROLO[3,2-C] PYRIDINES BY THE ACTION OF ETHYL PROPYNOATE. A NOVEL SYNTHESIS OF 2-TRIFLUOROACETYL-4,7,8,9-TETRAHYDRO-1H-PYRROLO[2,3-D]AZOCINES Article Voskresenskii L.G., Borisova T.N., Vorob'eva T.A., Grishachkina O.V., Kulikova L.N., Chernyshev A.I., Varlamov A.V. Russian Journal of Organic Chemistry. Vol. 42. 2006. P. 1851-1855