Cα-substituted 4-methylpyridines have been N-lithiated and reacted  with chlorotrimethylsilane and other electrophiles. The lithiated  Cα-NMe2 substituted intermediate shows an interesting dichotomy of behavior  towards electrophiles: It represents the borderline between compounds for which  an extreme N or Cα regio-nucleophilicity is observed.
                                    Cα-取代的4-
甲基吡啶已被N-
锂化,并与
氯三甲基
硅烷和其他电亲体反应。
锂化的Cα-NMe2取代中间体在对电亲体的反应中表现出有趣的二分法行为:它代表了那些观察到极端N或Cα区位亲核性化合物之间的边界。