Preparation of Highly Functionalized Pyridylmagnesium Reagents for the Synthesis of Polyfunctional Pyridines
作者:Laurent Bérillon、Anne Leprêtre、Alain Turck、Nelly Plé、Guy Quéguiner、Gérard Cahiez、Paul Knochel
DOI:10.1055/s-1998-17871
日期:1998.12
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。