Facile Substitution of <i>N</i>,<i>N</i>-Dimethylanilines and Phenols with Trifluoroacetaldehyde Ethyl Hemiacetal
作者:Yuefa Gong、Katsuya Kato、Hiroshi Kimoto
DOI:10.1055/s-1999-2867
日期:1999.9
2,2,2-Trifluoro-1-(N,N-dimethylaminophenyl)ethanols were easily formed in excellent yields by electrophilic substitution between N-N-dimethylanilines 1a, b and trifluoroacetaldehyde ethyl hemiacetal (TFAE). The corresponding substitution of phenols 2a-e to prepare 2,2,2-trifluoro-1-(hydroxyphenyl)ethanols, however, occurred only in the presence of catalytic amounts of anhydrous potassium carbonate.
通过 N-N-二甲基苯胺 1a 和 b 与三氟乙醛乙基半缩醛(TFAE)之间的亲电取代作用,很容易生成 2,2,2-三氟-1-(N,N-二甲氨基苯基)乙醇,且收率极高。然而,只有在无水碳酸钾的催化下,苯酚 2a-e 才能发生相应的取代反应,制备出 2,2,2-三氟-1-(羟基苯基)乙醇。