Este trabalho descreve a síntese de dois novos trifluoracetilceteno O,N-acetais [CF3C(O) CH=C(OEt)(NS(O)R2), onde R = CH3, Ph], obtidos da reação de 4,4-dietóxi-1,1,1-trifluorbut-3- en-2-ona [CF3C(O)CH=C(OEt)2] com S,S-dimetil- e S-metil-S-fenil-sulfoximida [HN=S(O)R2], na presença de trietilamina, com rendimentos de 60-72%, e suas aplicações na obtenção de pirazóis, isoxazóis e pirimidinas S,S-dimetilsulfoximido substituídos, em 55-89% de rendimento, a partir de reações de 4-etóxi-4-(S,S-dimetilsulfoximido)-1,1,1-trifluorbut-3-en-2-ona com hidrazinas, hidrazidas, cloridrato de hidroxilamina e acetilguanidina.
Two new trifluoroacetylketene O,N-acetals [CF3C(O)CH=C(OEt)(NS(O)R2), where R = CH3, Ph] derived from the reaction of 4,4-diethoxy-1,1,1-trifluorobut-3-en-2-one [CF3C(O)CH=C(OEt)2] with S,S-dimethyl- and S-methyl-S-phenyl-sulfoximide [HN=S(O)R2], in the presence of triethylamine, have been obtained, in 60-72% yields, and applied in the synthesis of S,S-dimethylsulfoximido-substituted pyrazoles, isoxazoles and pyrimidines, in 55-89% yields, from the reactions of 4-ethoxy-4-(S,S-dimethylsulfoximido)-1,1,1-trifluorobut-3-en-2-one with hydrazines, hydroxylamine hydrochloride and acetylguanidine.