A new synthetic route to 3-polyfluoroalkyl-containing pyrroles

A novel approach to 3-polyfluoroalkyl pyrroles is reported based on step by step reactions: 1,2-addition of Me3SiCN to β-alkoxyvinyl polyfluoroalkyl ketones, reduction with LiAlH4 and subsequent hydrolysis with intramolecular cyclization. The hydrolytic instability of various polyfluoroalkyl groups at position 3 of the pyrrole ring was evident and a pathway for the hydrolysis was proposed.