ortho-Selective metalation and electrophilic substitution of benzylamine derivatives
作者:Gyula Simig、Manfred Schlosser
DOI:10.1016/s0040-4039(00)80473-6
日期:1988.1
N-Pivaloylbenzylamines and derivatives thereof undergo smooth ortho-metalation when treated with two equivalents of an organolithium reagent. Subsequent carboxylation or hydroxylation lead to a variety of new products.
Unexpected Variations in Sites of Lithiation of N-(2-Methoxybenzyl)-pivalamide
作者:Keith Smith、Gamal El-Hiti、Amany Hegazy
DOI:10.1055/s-0029-1217722
日期:2009.9
Directed lithiation of N-(2-methoxybenzyl)pivalamide with two mole equivalents of t-BuLi in anhydrous THF at -78 ˚C followed by reactions with various electrophiles gave ring substitution, but ortho to the methoxy group rather than ortho to the pivaloylaminomethyl group, which was unexpected in view of earlier results reported with n-BuLi.