Transition-Metal-Free BF<sub>3</sub>-Mediated Oxidative and Non-Oxidative Cross-Coupling of Pyridines
作者:Quan Chen、Thierry León、Paul Knochel
DOI:10.1002/anie.201400750
日期:2014.8.11
We report a BF3‐mediated direct alkynylation of pyridines at C(2) by using a variety of alkynyllithium reagents (oxidative cross‐coupling). Moreover, we have developed a novel transition‐metal‐free cross‐coupling method between alkylmagnesium reagents and 4‐substituted pyridines, such as isonicotinonitrile and 4‐chloropyridine, by employing BF3⋅OEt2 as a promoter. The combination of these methods enabled