Abstract
2‐Ethoxy carbonylcyclopentanone (1) has been brominated to yield 2‐bromo‐2‐ethoxy carbonylcyclopentanone (2) which on further reaction with substituted thiosemicarbazones, thiocarbohydrazones, thiocarbamides and carbamides has furnished 1‐thia‐3,4‐diaza‐5,7‐dioxo‐2‐[(substituted benzylidine)‐amino]spiro[4.5]dec‐2‐ene (3a–e), 1‐thia‐3,4‐diaza‐5,7‐dioxo‐2‐[(substituted benzylidine)‐hydrazino] spiro[4.5]dec‐2‐ene (4a–e), 1‐thia‐3‐aza‐2‐(substituted imino)‐4,6‐dioxo‐spiro[4.4]nonane (5a–f) and 1‐oxa‐3‐aza‐2‐(substituted imino)‐4,6‐dioxo‐spiro[4.4]nonane (6a–g) respectively. The structures of the compounds have been elucidated on the basis of spectral analysis.
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