Polyfluoro-2-alkynoic acids, RfCCCOOH (RfHCF2, CF3, H(CF2)3), readily undergo tandem intermolecular-intramolecular Michael addition with bifunctional hetero nucleophiles, HX(CH2)n,YH (X,YS, O; n2, 3), to give 2-polyfluoroalkyl-ated 1,3-diheterocyclic compounds in good to excellent yields.
Tandem Intermolecular–Intramolecular Michael Addition of Bifunctional Hetero Nucleophiles to Polyfluoro-2-alkynoic Acids. Facile Synthesis of Polyfluoroalkylated Azaheterocycles
Polyfluoro-2-alkynoic acids, Rf–C≡C–COOH (1a—c: a, Rf = CHF2; b, Rf = CF3; c, Rf = CHF2CF2CF2), readily underwent an intermolecular–intramolecular Michael addition reaction with a variety of bifunctional azanucleophiles, such as RNHCH2CH2XH (R = H, Me; X = NH, S, O, NMe) and o-phenylenediamine, to give the corresponding carboxylated and/or decarboxylated 2-(polyfluoroalkyl)imidazolidine, thiazolidine
An efficient and convenient synthesis of 4-polyfluoroalkylated pyrrole-3-carboxylates through 1,3-dipolar cycloaddition reaction of polyfluoro-2-alkynoic acid esters with munchnones
1,3-Dipolarcycloaddition between polyfluoro-2-alkynoicacidesters and 1,3-oxazolium 5-olates (munchnones) readily proceeds in a regiospecific manner under very mild reaction conditions, followed by simultaneous decarboxylation to afford 4-(polyfluoroalkyl)pyrrole-3-carboxylate derivatives in good yield.