Reactions of quaternary ammonium salt having a polyfluoroalkenyl group with secondary amines. A new convenient and stereoselective synthesis of β-trifluoromethylated enamines
作者:Hiroki Yamanaka、Keisuke Shiomi、Takashi Ishihara
DOI:10.1016/0040-4039(95)01506-d
日期:1995.10
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.
三甲基-[(Z)-2,3,3,3-四氟-1-丙烯基]碘化铵(1)在非质子极性溶剂中于70°C易释放出甲基碘,定量生成N,N-二甲基-[[ Z)-2,3,3,3-四氟-1-丙烯]胺(2a),与仲胺进行NN交换反应,立体选择性地导致相应的N,N-二烷基-[(Z -2,3 ,3,3-四氟-1-丙烯基]胺(2b-k)的收率很高。