... (C) The Chemical Society of Japan 1982 SYNTHESIS OF THIENO•k3,2-b•l PYRIDINES Masataka YOKOYAMA,* Masanori TOHNISHI, Akemi KURIHARA, and Tsuneo IMAMOTO Department of Chemistry, Faculty of Science, Chiba University, Y ayoi-cho, Chiba City 260 ... nucleophile owing to electrostatic repulsion. Scheme 1 Scheme 2 References 1) M.Yokoyama, M.Kurauchi, and T.Imamoto, Tetrahedron Lett., 1981, 2285. 2) JMBarker, Adv. Heterocycl. ...