Abstract
The new Z-5-arylmethylene-4-thioxo-thiazolidine derivatives have been synthesized by condensation of ω -(4-formylphenoxy)acetophenone derivatives with 4-thioxo-thiazolidine derivatives, in good yields. The cycloaddition of the newly synthesized compounds to N-arylmaleimides, N-phenyl-1,2,4-triazole-3,5-dione, ethyl acrylate and ω -nitrostyrene has been studied. Under thermal reaction conditions [4 + 2] cycloaddition proceeds with complete site- and regioselectivity to yield the new fused thiopyrano[2,3-d]thiazole derivatives.