Fluoride Ion-Promoted Reaction of Polyfluoro-1-propenyl<i>p</i>-Toluenesulfonate with Amines. Highly Efficient and General Access to (<i>Z</i>)-α-Fluoro-β-amino Acrylaldehydes
作者:Kazumasa Funabiki、Tetsuya Ohtsuki、Takashi Ishihara、Hiroki Yamanaka
DOI:10.1246/cl.1994.1075
日期:1994.6
2,3,3-Trifluoro-1-propenyl p-toluenesulfonate, readily available by dehydrofluorination of 2,2,3,3-tetrafluoropropyl p-toluenesulfonate, reacted smoothly with various primary or secondary amines in the presence of triethylamine and a catalytic amount of fluoride ion at ambient temperature for 3 h or at 70 °C for 1–2 h to afford the corresponding (Z)-α-fluoro-β-(alkylamino- or -dialkylamino)acrylaldehydes in good to excellent yields, together with the formation of p-toluenesulfonyl fluoride.
2,2,3,3-三氟-1-丙烯对甲苯磺酸酯,可通过 2,2,3,3-四氟丙基对甲苯磺酸酯的脱氢氟化反应获得、在三乙胺和催化量的氟离子存在下,在常温下反应 3 小时或在 70 °C 下反应 1-2 小时,与各种伯胺或仲胺顺利反应,得到相应的 (Z)-α-氟-β-(烷基氨基-或-二烷基氨基)丙烯醛,收率良好至极佳,同时生成对甲苯磺酰氟。