Substituted on the benzene ring 4-CF3-2H-chromenes have been prepared from substituted 2-(trifluoroacetyl)phenols and vinyltriphenylphosphonium chloride according to the Schweizer protocol in moderate to excellent yields. The influence of the type and the position of aromatic ring substituents on yields of 4-CF3-2H-chromenes have been investigated. It has been shown that 4-CF3-2H-chromenes are convenient
根据 Schweizer 协议,在苯环上取代的 4-CF 3 -2 H -色烯由取代的 2-(三
氟乙酰基)
苯酚和
乙烯基三苯基
氯化
鏻以中等至优异的产率制备。研究了芳环取代基的类型和位置对4-CF 3 -2 H-色烯收率的影响。已经表明4-CF 3 -2 H-色烯是4-CF 3 -
香豆素的方便前体。