Heterocyclic Ketenethioacetal Derivatives. XI. Reactions of Pyridinium and Isoquinolinium Allylides

Abstract

Desulfurization of pyridinium and isoquinolinium 3-cyano-2-methylthioallylides (I, II) with Raney-nickel gave the corresponding desulfurized pyridinium and isoquinolinium allylides. Treatment of I and II with 10% sodium hydroxide solution afforded the indolizine and pyrrolo [2, 1-a] isoquinoline derivatives, respectively. The reaction of I with hydrazine hydrate gave pyrazole derivatives in a good yield.