New Efficient Method for the Stereoselective Synthesis of<i>α</i>-(Trifluoromethyl)-<i>α</i>,<i>β</i>-unsaturated Amides. Lewis Acid-Catalyzed Reaction of 3,3,3-Trifluoro-1-propynylamine with Carbonyl Compounds
作者:Toshiya Mantani、Keisuke Shiomi、Takashi Ishihara、Hiroki Yamanaka
DOI:10.1246/cl.1999.855
日期:1999.9
N,N-Dibutyl-(3,3,3-trifluoro-1-propynyl)amine, prepared readily by the dehydrofluorination of N,N-dibutyl-(2,2,3,3,3-pentafluoropropyl)amine with lithium diisopropylamide at room temperature, smoothly reacted with a variety of aldehydes and ketones in the presence of a catalytic amount of Lewis acid and molecular sieves 4A at ambient temperature to give the corresponding α-(trifluoromethyl)-α,β-unsaturated
N,N-二丁基-(3,3,3-三氟-1-丙炔基)胺,很容易通过 N,N-二丁基-(2,2,3,3,3-五氟丙基)胺与二异丙基氨基锂脱氟化氢制备在室温下,在催化量的路易斯酸和分子筛4A的存在下,在室温下与各种醛和酮平稳反应,得到相应的α-(三氟甲基)-α,β-不饱和酰胺,良好至极好以高 Z 立体选择性收率。