Synthesis of Thieno(2,3-h) (1,6)naphthyridine from 2-(3- Cyanopropylthio)pyridine-3-carbonitrile: Formation of a Novel Ring System.

An efficient methodology for the synthesis of novel ring system, thieno[2,3-h][1,6]naphthyridine, via a Smiles type rearrangement reaction and cyclization is described, its structure is confirmed by an X-ray structure analysis.