The condensation of 2-methylpyridine (I) with 2,3-dichlorobenzonitrile (II) by means of BuLi and diisopropylamine in THF gives the vinyl derivative (III), which is cyclized by heating at 200 C.
The condensation of 2-methylpyridine (I) with 2,6-dichlorobenzonitrile (II) by means of BuLi and diisopropylamine in THF gives the vinyl derivative (III), which is cyclized by heating at 200 C.