Efficient Preparation of [1-15N]-3-Cyano-4-methyl-1H-pyrrole by a Wittig-Based Strategy
作者:Prativa B. S. Dawadi、Johan Lugtenburg
DOI:10.1002/ejoc.200800079
日期:2008.5
3-Cyano-4-methyl-1H-pyrrole (1) was prepared by a new Wittig procedure from simple, commercially available starting materials in four steps with an overall yield of 39 %. Similarly, [1-15N]-3-cyano-4-methyl-1H-pyrrole (1a) was prepared starting from [15N]-phthalimide. In this synthesis, Wittig coupling was used to form the central C–C bond of intermediate 6, which has nitrile and methyl substituents
3-氰基-4-甲基-1H-吡咯 (1) 是通过新的 Wittig 程序从简单的市售原材料分四步制备的,总产率为 39%。类似地,从[15N]-邻苯二甲酰亚胺开始制备[1-15N]-3-氰基-4-甲基-1H-吡咯(1a)。在该合成中,Wittig 偶联用于形成中间体 6 的中心 C-C 键,中间体具有腈和甲基取代基。在脱保护和环化后,一锅中直接获得吡咯 1。该方案还允许在任何位置或位置组合处稳定掺入同位素。3-氰基-4-甲基-1H-吡咯转化为新型1-苄基-3-氰基-4-甲基吡咯和新型4-甲基-1H-吡咯-3-醛。很明显,这种新颖的 Wittig 程序具有广泛的范围,可以轻松制备许多新的吡咯系统。