Z 99 [3+2]- Versus [4+2]-cycloaddition reactions of 3-methylsulfanyl-2-arylazo-3-(pyrrolidin-1-yl)acrylonitriles with N-substituted maleimides involving pyrrolidine-derived azomethine ylides [Text] / T. G. Deryabina, N. P. Belskaia, M. I. Kodess, V. A. Bakulev // Tetrahedron Letters. - 2006. - Vol. 47, № 11. - P1853-1855 Рубрики: ХИМИЧЕСКИЕ НАУКИ Аннотация: 3-Methylsulfanyl-2-arylazo-3-(pyrrolidin-1-yl)acrylonitriles do not enter into [4+2]-cycloaddition reactions with maleimides to form the expected pyrrolo-pyridazines. Instead the formation of novel pyrrolo-pyridazines of type 4 takes place via a formal [3+2]-cycloaddition of initially formed pyrrolidine-derived azomethine ylides 7. The mechanism leading to the final product is discussed???? \\\\Expert2\\nbo\\Tetrahedron Letters\\2006, v. 47, p.1853.pdf |