eight-membered nitrogen heterocycles 20a,b is described starting from the 3-alkyl-N-benzylpyridinium salts 14a,b. These azocine derivatives were converted into their respective iminium salts 11 by treatment with methanesulfonic acid. A study concerning the regioselectivity of nucleophilic additions to these salts is presented. Nucleophiles like hydride or Grignard reagents react selectively in the 2-position
描述了从 3-烷基-N-
苄基吡啶鎓盐 14a、b 开始生成八元氮杂环 20a、b 的路线。通过用
甲磺酸处理,这些偶氮辛衍
生物被转化为它们各自的
亚胺盐11。介绍了对这些盐的亲核加成的区域选择性的研究。亲核试剂如
氢化物或
格氏试剂在 2 位选择性反应生成加合物,如 22 和 23,而
叠氮化物和苯
硫醇盐分别攻击 6 位生成 24 和 25。(© Wiley-
VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005)