A direct route to 6,6 '-disubstituted-2,2 '-bipyridines by double Diels-Alder/retro Diels-Alder reaction of 5,5 '-bi-1,2,4-triazines. Part 29. 1,2,4-triazines in organic synthesis

Inverse electron demand Diels-Alder reaction of functionalized 5,5'-bi-1,2,4-triazines with bicyclo[2.2.1]hepta-2,5-diene in boiling p-cymene leads to a range of 6,6'disubstituted-2,2'-bipyridines in good yield.