Unusual [3+2]-cycloaddition of acrylic acid derivatives to 7-formyl-4,5,6,7-tetrahydro-4,5,7-trimethylpyrrolo[3,2-c]-pyridine under Michael reaction conditions

8-Substituted tetrahydropyrido[3,2-e]pyrrolizines are formed in the [3+2]-cycloaddition of 2-formyltetrahydropyrrolo[3,2-c]pyridine and acrolein, acrylonitrile, and methyl acrylate in the presence of trilon B. © 1999 Kluwer Academic/Plenum Publishers.