Ring closure reactions O 0130Reactions with Dimethylformamide-Dimethylacetal: Synthesis and Reactions of Several New Pyridine and Pyrazolo[3,4-b]pyridine Derivatives. -The substituted pyridine-2(1H)-thiones (I) are used as precursors for the synthesis of several new fused heterocycles such as (IV), (VIII), and (XI). The different reaction mechanisms are discussed. -(ELNEAIRY, M. A. A.; GAD-ELKAREEM*, M. A. M.; TAHA, A. M.; Heteroat. Chem. 18 (2007) 4, 399-404; Dep. Chem., Fac. Sci., Al-Azhar Univ., Assiut 71511, Egypt; Eng.) -H. Haber 38-035
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