Side-Chain Lithiation of 2- and 4-Substituted Pyridines: Synthesis of More Complex Substituted Pyridines
作者:Keith Smith、Gamal A. El-Hiti、Ahmed Fekri、Mohammed B. Alshammari
DOI:10.3987/com-12-s(n)33
日期:——
Lithiation of pyridines substituted in the 2- and 4-positions by acylaminomethyl groups, namely of the corresponding N-pyridinylmethyl)pivalamides, N'-(pyridinylmethyl)-N,N-dimethylureas and tert-butyl N-pyridinylmethylcarbamates, with two mole equivalents of t-BuLi in anhydrous THF at 78 oC takes place on the nitrogen and on the methylene group of the side-chain. The lithium reagents thus obtained
在 2 位和 4 位被酰基氨基甲基取代的吡啶锂化,即相应的 N-吡啶基甲基)新戊酰胺、N'-(吡啶基甲基)-N,N-二甲基脲和 N-吡啶基甲基氨基甲酸叔丁酯,具有两个摩尔当量t-BuLi 在 78 oC 的无水 THF 中发生在氮和侧链的亚甲基上。由此获得的锂试剂与多种亲电试剂反应以高产率产生相应的侧链取代衍生物。