Functionalized iodopyridines bearing either a chloride, ester or nitrile function were converted to the corresponding organomagnesium derivatives at -40 °C or -78 °C by treatment with i-PrMgBr (1.1 equiv, 0.5 h, > 90% yield). The resulting functionalized Grignard reagents react with aldehydes, TosCN directly or with allylic bromides and benzoyl chloride after transmetalation with CuCN leading to polyfunctional pyridines.
功能化的
碘吡啶,带有
氯、酯或腈基,通过与i-PrMgBr(1.1当量,0.5小时,> 90%产率)反应,在-40°C或-78°C下转换为相应的
有机镁衍
生物。所得到的功能化
格氏试剂与醛、TosCN直接反应,或在与CuCN进行跨
金属反应后,与烯丙基
溴化物和
苯甲酰氯反应,从而生成多官能团
吡啶。