Highly Selective Metalations of Pyridines and Related Heterocycles Using New Frustrated Lewis Pairs or tmp-Zinc and tmp-Magnesium Bases with BF3⋅OEt2
作者:Milica Jaric、Benjamin A. Haag、Andreas Unsinn、Konstantin Karaghiosoff、Paul Knochel
DOI:10.1002/anie.201002031
日期:——
Efficient and selective: FrustratedLewispairs based on BF3⋅OEt2 and LiCl‐complexed tmpMg or tmpZn amides (tmp=2,2,6,6‐tetramethylpiperidyl) allow the efficient and regioselective metalation of various functionalized N heterocycles (see scheme for examples). Moreover, such metalations carried out in the presence or absence of BF3⋅OEt2 enable a complete switch of regioselectivity, thus allowing complementary