New Synthetic Protocol with Trifluoro-1-propynylamines. An Efficient Access to α-(Trifluoromethyl)-δ-keto Amides<i>via</i>Hetero Diels-Alder Reaction
作者:Toshiya Mantani、Tsutomu Konno、Takashi Ishihara、Hiroki Yamanaka
DOI:10.1246/cl.2000.666
日期:2000.6
N,N-Dibutyl(3,3,3-trifluoro-1-propynyl)amine readily reacts with α,β-unsaturated ketones or aldehydes in refluxing benzene for 3–36 h to form the corresponding Diels-Alder adducts, 2-(dibutylamino)-3-(trifluoromethyl)-4H-pyrans, of which the successive treatment with alumina at ambient temperature for 1 h leads to the ring-opening products, α-trifluoromethylated δ-keto amides in fairly good to excellent yields.
N,N-二丁基(3,3,3-三氟-1-丙炔)胺在回流苯中与α,β-不饱和酮或醛反应3到36小时,可以生成相应的Diels-Alder加合物,即2-(二丁基氨基)-3-(三氟甲基)-4H-吡喃,随后在室温下用铝土矿处理1小时,会得到环打开的产物,α-三氟甲基化δ-酮酰胺,产率相当良好到优异。