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