SYNTHESIS OF NEW SPIRO HETEROCYCLIC-COMPOUNDS DERIVED FROM RHODANINE DERIVATIVES

5,5-Dibromo-3-phenyl-2-thioxo-4-thiazolidinone 2, was reacted with bid entates, or with CS, and active methylenes under PTC conditions to aff ord the corresponding spiro compounds 4a-h or 5a-e. ethoxymethylene-3- phenyl-2-thioxo-4-thiazolidinone 3 was treated with diamino or aminome rcapto compounds to give the desired products 6a-d. Treatment of compo und 3 with malononitrile gave compound 7. Reaction of compound 7 with some active methylenes affords the corresponding spiro cyclopentenes 8 a-c.