Studies on anti-Fusarium disease activity of aminonitrile derivatives. I. Preventive activities of N-substituted-.ALPHA.-aminonitriles against Fusarium diseases.
Forty nine N-substituted-α-aminonitriles were prepared and their preventive activities against Fusarium diseases were determined. Relationships between chemical structure and preventive activity were examined and the systemic movement in plants was investigated with 14C-N-allylaminoacetonitrile. Of the compounds tested, N-sec-butyl-α-aminoisobutyronitrile and N-allylaminoacetonitrile were most effective in controlling yellows of the Japanese radish which were caused by Fusarium oxvsporum f. sp. raphani. N-Allylaminoacetonitrile showed remarkable systemic movement and a potent preventive activity against Fusarium wilts of cucumber and tomato not only by the soil drench test but also by the foliar spray assay.
Exploiting superacid activation, the reactivity of aminonitriles was enhanced through the transient formation of highly reactive ammonium–nitrilium superelectrophiles.
利用超酸激活,氨基腈的反应性通过瞬时形成高度活性的铵盐-腈盐超电亲电子体得到增强。
Aryne-Mediated [2,3]-Sigmatropic Rearrangement of Tertiary Allylic Amines
3]-sigmatropic rearrangement of quaternary allylic ammonium ylides via in situ activation of tertiary allylicamines with arynes under mild conditions. Using 2-(trimethylsilyl)aryl triflates as aryne precursors, a range of tertiary allylicamines bearing electron-withdrawing groups underwent [2,3]-sigmatropic rearrangement to furnish structurally diverse homoallylic amines in moderate to good yields. The reaction
This paper describes the scope and limitations of the hydrofluorination reaction in superacid HF/SbF5. On the basis of experimental studies of polyfunctional substrates’ behaviour, the dramatic effect of substitution on the superelectrophilic character of ammonium–carbenium dications was emphasized. This reaction was applied to the synthesis of novel fluorinated key building blocks. Furthermore, the hydrofluorination reaction and the discovered homodimerization/fluorination reaction were applied to the synthesis of highly valued fluorinated diamines.