Pyranothiazoles, and spiro-thiazolidinediones were synthesized by the react
ion of active methylene group present in 2,4-thiazolidinedione with differe
nt chalcones and alpha-cyano-alpha,beta-unsaturated nitriles in the presenc
e of mild/strong bases. Structural assignments of the new compounds are bas
ed on the analytical and spectral data.