Synthesis of heteroaromatic ketene dithioacetals

Article abstract of DOI:10.1055/s-1990-27071

Reaction of 2-methylpyridine with, successively, lithium diisopropylamide, carbon disulphide, and 1,2-dibromoethane or 1,3-dibromopropane, gives 2-(2-pyridylmethylene)dithiolane or 2-(2-pyridylmethylene)dithiane. Analogous reactions of 2-methylpyrazine, 2-methylquinoline, 2,6-dimethylpyridine and 2,3-dimethylpyrazine are reported.