Alkyl 3-chloropyrrole-2-carboxylates and 2-alkanoyl-3-chloropyrroles are conveniently prepared from 2-alkyl-1-pyrrolines by tetra-and pentahalogenation with N- chlorosuccinimide, subsequent base-induced aromatisation with sodium alkoxides in the corresponding alcohol and final acid hydrolysis of the resulting orthoester or acetal functions into the 3-chloropyrrole. The developed strategy is applied to the synthesis of the trail ...
