Synthesis of 2,2′-bipyridyl-type compounds via the suzuki-miyaura cross-coupling reaction
作者:Nicholas A. Jones、James W. Antoon、Alfred L. Bowie、J. Brian Borak、Erland P. Stevens
DOI:10.1002/jhet.5570440213
日期:2007.3
2,2′-Bipyridyl-typecompounds may be prepared by Suzuki-Miyaura coupling of a 2-pyridylboronic ester with 2-haloazines and -azoles. Ten examples are presented with yields of 47 to 84%. Both arylbromides and arylchlorides undergo the coupling, but the reaction is sensitive to ring substitution adjacent to the halogen.
Starting from commercial chlorodiazines, we report the synthesis of pyridin-2-yldiazines. The first lithiation and functionalization of these compounds are reported and the regioselectivity of the metallation is discussed. The functionalization via the metallation reaction, provides a new access to substituted pyridin-2-yldiazines, which could be used as building blocks in supramolecules.