4-Trifluoromethyl-2 (5H)-furanone (2) and 4-trifluoromethyl-N-substituted dihydropyrrol-2-ones (4) were effectively prepared from ethyl (Z)-4-bromo-3-trifluoromethyl-2-butenoate (1). The dihydropyrrol-2-ones (4) were found to consist of the Δ3-and/or Δ4-form, and the electronic nature of the substituent on nitrogen affected the isomer ratio.
由(Z)-4-
溴-3-三
氟甲基-
2-丁烯酸乙酯(1)有效地制备了 4-三
氟甲基-2 (5H)-
呋喃酮(2)和 4-三
氟甲基-N-取代的二氢
吡咯-2-酮(4)。发现二氢
吡咯-2-酮(4)由Δ3和/或Δ4形式组成,氮上取代基的电子性质影响了异构体的比例。