Chemical and microsomal oxidation of tertiary amides: regio- and stereoselective aspects
作者:Jim Iley、Roberto Tolando、Luis Constantino
DOI:10.1039/b102731j
日期:——
TPPFe/ButOOH reaction ring oxidation is preferred to N-demethylation, paralleling the relative stabilities of the corresponding intermediate carbon-centred radicals as calculated by the AM1 semi-empirical method. In contrast, the microsomal reaction of the N-methyllactams strongly favours N-demethylation, demonstrating that hydrogen atom abstraction from the alkyl group Z to the amide carbonyl oxygen atom is preferred
构象受限 叔酰胺 N-甲基-2-吡咯烷酮 在图6中,N-甲基-2-哌啶酮7和N-甲基-ε-己内酰胺8被5,10,15,20-四苯基卟啉toiron(III)氯化物/氧化。叔丁基过氧化氢(TPPFe / Bu t OOH)和苯巴比妥诱导的大鼠肝微粒体。产物是N-去甲基化的内酰胺类以及类似的N-甲基酰亚胺和诺里米德。对于TPPFe / Bu t OOH反应环氧化作用与N-脱甲基化相比,“亚甲基”是优选的,其平行于通过AM1半经验方法计算的相应的以碳为中心的中间自由基的相对稳定性。相比之下,N-甲基内酰胺类的微粒体反应强烈促进N-脱甲基化,这表明从H-甲基内酰胺中提取氢原子烷基 Z到酰胺 羰氧原子是优选的。手性叔酰胺 N-甲基-N-(1-苯乙基)苯甲酰胺 9和N-甲基-5-苯基-2-吡咯烷酮 10也通过TPPFe /卜氧化吨OOH和由苯巴比妥诱导的大鼠肝微粒体。使用TPPPe / Bu t OOH,优选9的仲烷基的损失约为1倍。6