Collect. Czech. Chem. Commun. 1992, 57, 1747-1757

The Uses of Ethyl Cyanobromoacetate in Heterocyclic Synthesis: Novel Synthesis of Thiophene, Pyrazolo[3,4d]thiazole and Thieno[2,3d]pyridazine Derivatives

Rafat Milad Mohareba, Salah El-Kousyb and Abdel Monem El-Torgomanb

a Chemistry Department, Faculty of Science, Cairo University, Giza, Egypt
b Chemistry Department, Faculty of Science, Menofia University, Shibin El-Kom, Egypt


The reaction of active methylene reagents Ia-Ie with phenyl isothiocyanate in basic N,N-dimethylformamide solution followed by cyclization with ethyl cyanobromoacetate II affords the acyclic thioether derivatives IVa-IVe. The use of IVa-IVe in heterocyclic synthesis was described.