was obtained in 79% yield, while the trifluoroacetyl product 17x could only be isolated in 9% yield while most of the starting material (56%) was recovered. Interestingly, the p-CF3-benzoyl derivative 17w, having a phenyl group between the acyl and trifluoromethyl group in comparison to the derivative 17x, could also be successfully synthesized and isolated in 54%. This opens up the possibility to transfer the method to other fluorinecontaining groups, leading to extension of the developed approach. Cyclization precursors bearing benzoyl, butanoyl and 2,4,6-trichlorobenzoyl moieties did not react under described conditions (please see SI for unsuccessful experiments).