Double nucleophilic reaction of amines to the imidazole nucleus and selective synthesis of 5-aminoimidazoles
作者:Ikuo Kawasaki、Tomohisa Osaki、Kazuya Tsunoda、Emiko Watanabe、Makie Matsuyama、Akiko Sanai、Abdul Khadeer、Masayuki Yamashita、Shunsaku Ohta
DOI:10.1016/j.tet.2004.05.088
日期:2004.7
Reaction of 2-(1-chloro-2,2-dimethylpropyl)-1-methyl-1H-imidazole with an excess of N,N-dimethylamine at room temperature gave an abnormal adduct, trans-4,5-bis(dimethylamino)-1-methyl-2,2-dimethylpropyl-2-imidazoline, which was derived from a serial, double nucleophilic addition into the imidazole nucleus in 74% yield together with a normal SN product, 1-methyl-2-(1-dimethylamino-2,2-dimethylpropyl)-1H-imidazole
2-(1-氯-2,2-二甲基丙基)-1-甲基-1 H-咪唑在室温下与过量的N,N-二甲基胺反应生成异常的加合物,反式-4,5-双(二甲基氨基) )-1-甲基-2,2-二甲基丙基-2-咪唑啉,由串联双亲核加成到咪唑核中,产率为74%,与正常的S N产物1-甲基-2-(1 -二甲基氨基-2,2-二甲基丙基)-1 H-咪唑,产率为15%。仅通过在甲苯中回流就可以将前者容易地转化为1-甲基-5-(二甲基氨基)-2-(2,2-二甲基丙基)-1 H-咪唑,产率为90%。讨论了这些反应的范围,机理和局限性。