Preparation of α-Phosphono Lactams via Electrophilic Phosphorus Reagents: An Application in the Synthesis of Lactam-Based Farnesyl Transferase Inhibitors
作者:Yanming Du、David F. Wiemer
DOI:10.1021/jo020119l
日期:2002.8.1
lactams has been investigated through procedures that involve formation of the lactam enolate and reaction with a phosphorus electrophile. With N-octylpyrrolidinone, the enolate could be trapped efficiently on oxygen by reaction with diethyl phosphorochloridate, and the resulting vinyl phosphate rearranges smoothly to the desired phosphonate upon treatment with additional LDA. Attempts to apply the same
N-烷基内酰胺转化为相应的α-膦酰基内酰胺已通过包括形成内酰胺烯醇化物和与磷亲电试剂反应的方法进行了研究。使用N-辛基吡咯烷酮,可以通过与磷酸氯二乙酯反应将烯醇化物有效地捕获在氧气上,并且在用另外的LDA处理后,所得的磷酸乙烯基酯平稳地重排为所需的膦酸酯。尝试将相同的方案应用于N-法呢基内酰胺的尝试取得了有限的成功。用分离的α-膦酰基N-法呢基内酰胺进行的研究表明,法呢基对磷酸乙烯基酯重排所需的过量强碱不稳定。但是,通过形成内酰胺烯醇化物,一系列N-法呢基内酰胺和酰亚胺被转化为所需的膦酸酯,