Multicomponent reactions of ethyl 1-trifluoromethyl-2-(trimethylsilyloxy)cyclopropanecarboxylate, isonitriles, and either 2-aminopyridine or amino acids provided imidazo[1,2-a]pyridines or γ-lactams, respectively. This access to trifluoromethyl-substituted heterocycles demonstrates again that siloxycyclopropanes can serve as hidden functionalized aldehydes and that this type of donor–acceptor-substituted cyclopropanes is particularly versatile.
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Notes
Signals marked with an asterisk were assigned to the minor diastereomers.
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Published in Khimiya Geterotsiklicheskikh Soedinenii, 2017, 53(4), 416–421
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Gladow, D., Senf, D., Wiecko, J. et al. New trifluoromethyl-substituted heterocycles by multicomponent reactions of siloxycyclopropanes. Chem Heterocycl Comp 53, 416–421 (2017). https://doi.org/10.1007/s10593-017-2068-y
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DOI: https://doi.org/10.1007/s10593-017-2068-y