Competition and co-operation between ortho directing groups and activating agents: Regioselective metallation of 1-(methoxyphenyl)pyrroles
作者:Ferenc Faigl、Katalin Fogassy、Angelika Thurner、László Tőke
DOI:10.1016/s0040-4020(97)00183-x
日期:1997.3
di- and tri-dentate tertiary amine type ligands was studied in regioselective lithiation reactions of 1-(methoxyphenyl)pyrroles with butyllithium (LIC). Clean α-metallation of the pyrrole ring occured when N,N,N′,N′,N″-pentamethyldiethylenetriamine (PMDTA) was used while the benzene ring was lithiated ortho position to the methoxy group in the presence of N,N,N′,N′-tetramethylethylenediamine (TMEDA)
研究了二齿和三齿叔胺型配体在1-(甲氧基苯基)吡咯与丁基锂(LIC)的区域选择性锂化反应中的作用。当使用N,N,N',N',N''-五甲基二亚乙基三胺(PMDTA)时,在N,N,N存在的情况下将苯环锂化为邻位甲氧基时,吡咯环会发生纯净的α-金属化′,N′-四甲基乙二胺(TMEDA)。