the amine, and is also influenced by the nature of the solvent. Primary aliphatic 1,2- or 1,3-diamines yield cyclic aminals which are imidazolidine (8a) and hexahydropyrimidine (8b) derivatives. Reactions of these aminals with Grignard reagents, and with cyanide anion as nucleophiles, are also described.
苯并三唑(BtH)在
水性介质中容易与脂肪族
伯胺和
甲醛反应生成三种或更多种产品中的一种或多种:(i)(BtCH 2)2 NR(5),(ii)(BtCH 2 NR)2 CH 2(6)和/或(iii)BtCH 2 NHR(7)。形成的产物取决于底物的摩尔比以及胺中的空间位阻程度,并且还受溶剂性质的影响。伯脂族1,2-或1,3-二胺生成的环状
缩醛是
咪唑烷(8a)和六氢
嘧啶(8b))衍生产品。还描述了这些
缩醛与
格氏试剂以及
氰化物阴离子作为亲核试剂的反应。