Synthesis of ortho-cyanopyridylboronic acids and esters toward cyano-functionalized bipyridines
This work describes the synthesis of ortho-cyanopyridylboronic acids and esters. Their reactivity with pyridine halides in the Suzuki cross-coupling reaction is evaluated and shows that the cyanopyridyl boronic esters appear to be more stable than their corresponding acids. These esters allowed us to synthesize new cyanobipyridine systems. Georg Thieme Verlag Stuttgart.