Effets du solvant et du complexant sur la regioselectivite de la metallation. Cas de la (furyl-2)-2 pyridine
作者:P. Ribéreau、G. Quéguiner
DOI:10.1016/s0040-4020(01)88670-1
日期:1983.1
Lithiation of 2-(2-furyl)pyridine with n-butyllithium is dependent upon the nature of the solvent, lithium complexant, and temperature. ω-Lithiation of the furan ring increases with the importance of the solvation of the lithium atom (TMEDA > THF > ether > hexane). The α substituted derivative, which is the thermodynamically controlled product, is obtained in ether with a good yield either with DABCO-BuLi