Reactions of quaternary ammonium salt having a polyfluoroalkenyl group with secondary amines. A new convenient and stereoselective synthesis of β-trifluoromethylated enamines
3,3,3-tetrafluoro-1-propenyl]ammonium iodide (1) easily liberated methyl iodide at 70 °C in an aprotic polar solvent to generate quantitatively N,N-dimethyl-[(Z)-2,3,3,3-tetrafluoro-1-propenyl]amine (2a), which underwent the N-N exchange reaction with secondary amines, leading stereoselectively to the corresponding N,N-dialkyl-[(Z-2,3,3,3-tetrafluoro-1-propenyl]amines (2b-k) in good yields.
Extremely simple route to β-fluoro vinamidinium salts: A novel reaction of (polyfluoro-1-propenyl)trimethylammonium iodides with primary or secondary amines
3-Trifluoro-1-propenyl)trimethylammonium iodides readily underwent demethylation-allylic substitution followed by N-N exchange reaction at ambient temperature or at 70 °C by the action of various secondaryamines or several primary amines to give the corresponding β-fluorinated vinamidinium salts in good yields.