Convenient and Facile Syntheses of 6-Trifluoromethyl-3,6-dihydro-2<i>H</i>-1,3,4-oxadiazines
作者:Yasuhiro Kamitori、Masaru Hojo、Ryōichi Masuda、Seiji Ohara、Kazuyoshi Kawasaki、Yoshihiko Kawamura
DOI:10.1055/s-1990-26916
日期:——
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。