Synthesis and semiempirical calculations of isatylidine,thioisatylidine and acenaphthylidine derivatives of imidazolidine,thiazolidine,oxazolidine and pyrimidinetrione

摘要

The Knovenaegel type condensation of benzo[b]thiophene-2,3-dione (thioisatin),indol-2,3-dione and acenaphthylene-1,2-dione with imidazolidine,oxazolidine,pyrimidinetrione and thiazolidine derivatives has been described:The newly synthesized products have been characterized by spectral techniques (IR,~1H NMR,~(13)C NMR and mass).Correlation of experimental results and exclusive formation of anti-monocondensation products has been ascertained on the basis of semiempirical calculations.