Abstract

Extrusion of sulfur dioxide from pyrrolo[1,2- c]thiazole-2,2-dioxides led to the synthesis of functionalised pyrroles via the generation of 1-azafulvenium methides. Sealed tube reaction conditions allowed the synthesis of N- and C-vinylpyrroles whereas from FVP methyl 1,3-dimethyl-5-oxo-5 H-pyrrolizine-2-carboxylate and 4-oxo-1,4-dihydro-1-aza-benzo[ f]azulene-3-carboxylates were obtained. These last compounds could also be obtained from the FVP of the N- and C-vinylpyrroles.

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