4-tert-Butylphenols can be easily transformed into 4-fluorophenols, provided that no coordinating moiety is present in 2-position, in a two step procedure under mild and safe conditions. The first step leads to 4-tert-butyl-4-fluorocyclohexa-2,5-dien-1-ones through an oxidative fluorination with [bis(trifluoroacetoxy)iodo]benzene and triethylamine tris(hydrofluoride), and is followed by an acid catalyzed aromatization with loss of isobutene. When extended to 4-tert-butylacetanilide, this method delivers 4-fluoroacetanilide in a single step but in a modest yield.
4-
tert-丁基
酚可以在温和且安全的条件下,通过两步程序轻松转化为
4-氟苯酚,前提是2位没有配位基团存在。第一步通过氧化
氟化反应与[双(三
氟乙酰氧)
碘]苯和
三乙胺三氢
氟化物生成4-
tert-丁基-4-
氟环己-2,5-二烯酮,随后通过酸催化芳构化反应失去
异丁烯。当将此方法扩展至4-
tert-丁基
乙酰苯胺时,该方法可以在单步中将其转化为
4-氟乙酰苯胺,但产率较低。