A condensação do 3-formilcromano (1) com tiazolidina-2,4-diona (2) produziu 5-[4-oxo-4H-croman-3-ila)metileno]-1,3-tiazolidina-2,4-diona (3). A reação de 3 com hidrato de hidrazina, fenil hidrazina e hidrocloreto de hidroxilamina produziu os derivados correspondentes pirazol e isoxazol 4-7. O composto 3 reagiu com tiouréia, guanidina e cianoguanidina para produzir os derivados correspondentes de pirimidina 8-10. Pirimido
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