Trifluoromethyl-substituted heteroolefins (Schiffs bases): syntheses and chemical properties
作者:A. Haas、M. Lieb、M. Schelvis
DOI:10.1016/s0022-1139(97)00017-1
日期:1997.7
5,5,5-trifluoro-4-trifluoromethyl-pent-3-en-2-one (1) and 5,5,5-trifluoro-4-methyl-pent-3-en-2-one (2) are reacted with a number of ring-substituted anilines to give the corresponding imines 3–16 and 17. The preparation of 2 is accompanied by three unsaturated ketones (2a–c). The bistrifluoromethylated imines 3–16 exist as a mixture of their non-separable syn and anti isomers, which were identified
5,5,5-三氟-4-三氟甲基-戊-3-烯-2-酮(1)和5,5,5-三氟-4-甲基五-戊-3-烯-2-酮(2)是与许多环取代的苯胺反应生成相应的亚胺3-16和17。制备2时会伴有三个不饱和酮(2a–c)。双三氟甲基化的亚胺3-16以其不可分离的顺式异构体和反式异构体的混合物形式存在,这些异构体由13 C,19 F和11 H NMR光谱。这些亚胺中的一些在室温下与2,2-双(三氟甲基)-乙烯-1,1-碳二腈(BTF)反应生成4,4-双三氟-1,4-二氢吡啶鎓衍生物(18-22)。在这些添加物中还获得了两个副产物1-氨基-环戊-1-烯(23-27)和1-亚氨基-环戊-2-烯衍生物(28-32)。用伯烷基胺处理1可以得到抗迈克尔产物33-38。与2-氨基苄胺1形成苯并二氮杂衍生物39。