Several 6-trifluoromethyl-3,6-dihydro-2H-1,3,4-oxadiazines 2 were synthesized in good yields by treatment of trifluoroacetylated hydrazones 1, prepared from substituted benzaldehyde and alkanal dialkylhydrazones and trifluoroacetic anhydride, with trifluoroacetic acid at 25°C or acetic acid at 50°C. This is an improved method for the synthesis of 2 compared to previous methods developed in this laboratory.
通过在
三氟乙酸的作用下,在25°C下用
三氟乙酸或50°C下用
乙酸处理由取代
苯甲醛和烷基醛二烷基
腙和
三氟乙酸酐制备的三
氟乙酰腙1,可以合成几种6-三
氟甲基-3,6-二
氢-2H-1,3,4-恶二嗪2,且收率较高。与本实验室之前开发的方法相比,这是一种改进的2合成方法。