Synthesis and hydrogenation of (E)-γ-aryl-γ-morpholino-α-trifluoromethylated allyl alcohols through the reaction of trifluoroacetaldehyde ethyl hemiacetal with enamines
作者:Kazumasa Funabiki、Yoshihiro Murase、Yudai Furuno、Yasuhiro Kubota、Masahiro Ebihara、Masaki Matsui
DOI:10.1016/j.tet.2010.03.019
日期:2010.5
Treatment of trifluoroacetaldehyde ethyl hemiacetal with enamines, derived from acetophenone derivatives, at room temperature gave (E)-1,1,1-trifluoro-4-morpholino-4-aryl-but-3-en-2-ols, which are intermediates for preparation of the β-trifluoromethylated aldol products, 4,4,4-trifluoro-3-hydroxy-1-aryl-butan-1-ones. The structure of the intermediate (E)-1,1,1-trifluoro-4-morpholino-4-(4-nitrophenyl)-but-3-en-2-ols
在室温下,用苯乙酮衍生物衍生的烯胺处理三氟乙醛乙基半缩醛,得到中间体的(E)-1,1,1,1-三氟-4-吗啉代-4-芳基-丁-3-烯-2-醇用于制备β-三氟甲基化的羟醛产物,4,4,4-三氟-3-羟基-1-芳基-丁丹-1-酮。中间体(E)-1,1,1-三氟-4-吗啉代-4-(4-硝基苯基)-丁-3-烯-2-醇的结构可以通过1 H,13 C NMR,IR鉴定和X射线晶体学。此外,中间体(E)-1,1,1,1-三氟-4-吗啉代-4-芳基-丁-3-烯-2-醇与氢在催化量(10 mol%)的钯/碳在三氟乙醇中的存在下于110℃平稳进行在室温下以良好至优异的产率得到1,1,1-三氟-4-芳基-2-丁醇。