Cyanothioacetamide in the Synthesis of Spiro-Fused Hydrogenated Quinolinethiones

The reaction of cyanothioacetamide with a twofold molar excess of 1-(4-morpholino)cyclohexene in dry dioxane afforded previously unknown 3-cyano-4-cyclohexanespiro-1,2,3,4,5,6,7,8-octahydroquinoline-2-thione. Its structure was established by X-ray diffraction analysis and IR and 1H NMR spectroscopy.